Evidence used
- No CISA KEV confirmation is currently recorded.
- EPSS is 0.23% for the current model date.
BlackTreeCVE IntelligenceFull vulnerability report · 2026
CVE-2026-93981High confidence
hono/jsx before 4.13.7 Cross-Site Scripting via Unescaped Strings
honojs · hono
Official source article: GitHub GHSA-HXH3-VQPV-XPQV ↗. Check the applicable product and release in the original source.
2.3LowCVSS 4.0
Scheduled
Patch availableLow technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.
R
Open reassessment dashboard →Operational reassessment
Published severity in operational context
Published severityLow→Operational priority:Low, unchanged from published severity.unchanged
Compensating controls
- Validate the affected product branch and deploy the verified fixed release.
- Restrict the affected network interface to trusted sources where business-safe.
- Monitor vendor guidance and exploitation sources for a material change.
Verification
- Confirm that the asset runs honojs hono and falls inside the recorded affected range.
- Verify the installed build against the product-specific fixed version after deployment.
- Validate exposure, authentication requirements and compensating controls in the actual environment.
- Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Open-source package ranges2 source-attributed ranges
These OSV and GitHub advisory ranges apply only to the named package and ecosystem. A listed fixed version is not a universal product patch or proof that an update is installed.
| Ecosystem and package | Affected range | First fixed version | Evidence |
|---|---|---|---|
| npmhono | < 4.13.7 | 4.13.7 | GitHub advisory ↗upstream repository advisory · 30 Sep 2026 |
| npmhono | SEMVER: introduced 0; fixed 4.13.7 | 4.13.7 | OSV record ↗aggregator derived · 1 Oct 2026 |
Direct vendor intelligence
1 currentAuthoritative vendor CSAF and VEX advisories
Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.
CVE-2026-93981 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityhono: hono/jsx: Cross-Site Scripting via Unescaped Strings
The vendor explicitly identifies these products as affected by this CVE.
- mta/mta-solution-server-rhel9 as a component of Migration Toolkit for Applications 8
- ansible-automation-platform-27/mcp-server-rhel9 as a component of Red Hat Ansible Automation Platform 2
- ansible-automation-platform-tech-preview/mcp-server-rhel9 as a component of Red Hat Ansible Automation Platform 2
- grafana as a component of Red Hat Enterprise Linux 10
- grafana-selinux as a component of Red Hat Enterprise Linux 10
- grafana.src as a component of Red Hat Enterprise Linux 10
- rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI)
- devspaces/code-rhel9 as a component of Red Hat OpenShift Dev Spaces
- Summary
- A flaw was found in hono/jsx. This vulnerability occurs because the software fails to properly escape plain strings when they are rendered in certain contexts during server-side rendering. A remote attacker can exploit this by providing specially crafted input, leading to Cross-Site Scripting (XSS). This allows the attacker to inject malicious code into web pages viewed by other users, potentially compromising user sessions or defacing the website.
- Remediation
- For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
Low technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.
Patch available01
What, why and how
hono before 4.13.7 fails to HTML-escape plain strings rendered by hono/jsx as a child or fallback of Suspense, as a string child of ErrorBoundary alongside an asynchronous sibling, as the single child of a Context.Provider, or as the root value passed to renderToString() or renderToReadableStream() from hono/jsx/dom/server. These paths stringify their input and treat the result as already-escaped markup, so an attacker who controls such a string during server-side rendering can inject arbitrary HTML and execute script under the application's origin.
What
hono before 4.13.7 fails to HTML-escape plain strings rendered by hono/jsx as a child or fallback of Suspense, as a string child of ErrorBoundary alongside an asynchronous sibling, as the single child of a Context.Provider, or as the root value passed to renderToString() or renderToReadableStream() from hono/jsx/dom/server. These paths stringify their input and treat the result as already-escaped markup, so an attacker who controls such a string during server-side rendering can inject arbitrary HTML and execute script under the application's origin.
Why
Attacker-controlled content can reach a browser as executable script without sufficient output encoding or sanitisation.
How
An attacker operating through a network path may attempt exploitation when the stated preconditions are met. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
What
hono before 4.13.7 fails to HTML-escape plain strings rendered by hono/jsx as a child or fallback of Suspense, as a string child of ErrorBoundary alongside an asynchronous sibling, as the single child of a Context.Provider, or as the root value passed to renderToString() or renderToReadableStream() from hono/jsx/dom/server. These paths stringify their input and treat the result as already-escaped markup, so an attacker who controls such a string during server-side rendering can inject arbitrary HTML and execute script under the application's origin.
Why
Attacker-controlled content can reach a browser as executable script without sufficient output encoding or sanitisation.
How
An attacker operating through a network path may attempt exploitation when the stated preconditions are met. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
02
Exploit reality and attack path
CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.
Observed exploitation No confirmed evidence
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.
Public PoC / exploit material None recorded
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.
- Likely attack path
- a network path → Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') → cause the confidentiality, integrity or availability impact described by the vendor
- Attack surface
- Network
- Privileges required
- None: unauthenticated exploitation is possible
- User interaction
- Passive interaction required
- Attack complexity
- High: exploitation depends on specific conditions
- Security boundary
- Not a CVSS 4.0 base metric
- Weakness
?
CWE means Common Weakness Enumeration: a standard category for the underlying weakness. - CWE-79 ↗
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'). The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
- CVSS vector
?
CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity. CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:NCommon Vulnerability Scoring System 4.0: the compact vector below is decoded into plain language.
AVNetworkAttack vector: The vulnerable component can be reached over a network.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.ATPresentAttack requirements: A particular deployment or execution condition must be present.PRNonePrivileges required: The attacker does not need an account or existing privileges.UIPassiveUser interaction: A user must unknowingly interact with the vulnerable system.VCLowVulnerable-system confidentiality: A successful attack can cause a limited loss.VILowVulnerable-system integrity: A successful attack can cause a limited loss.VANoneVulnerable-system availability: No direct loss is represented by this metric.SCLowSubsequent-system confidentiality: A successful attack can cause a limited loss.SILowSubsequent-system integrity: A successful attack can cause a limited loss.SANoneSubsequent-system availability: No direct loss is represented by this metric.- Post-exploitation / living off the land
- No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
03
Patch and workaround
Operational remediation based on structured source evidence.
- Status
?
Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change. - Patch available
- Affected
- mta/mta-solution-server-rhel9 as a component of Migration Toolkit for Applications 8
- ansible-automation-platform-27/mcp-server-rhel9 as a component of Red Hat Ansible Automation Platform 2
- ansible-automation-platform-tech-preview/mcp-server-rhel9 as a component of Red Hat Ansible Automation Platform 2
- grafana as a component of Red Hat Enterprise Linux 10
- grafana-selinux as a component of Red Hat Enterprise Linux 10
- grafana.src as a component of Red Hat Enterprise Linux 10
- rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI)
- devspaces/code-rhel9 as a component of Red Hat OpenShift Dev Spaces
- Fixed
- grafana12.4-0:12.4.10-0.10.hum1@aarch64 as a component of Red Hat Hardened Images
- grafana12.4-0:12.4.10-0.10.hum1@src as a component of Red Hat Hardened Images
- grafana12.4-0:12.4.10-0.10.hum1@x86_64 as a component of Red Hat Hardened Images
- grafana13.1-0:13.1.6-0.5.hum1@aarch64 as a component of Red Hat Hardened Images
- grafana13.1-0:13.1.6-0.5.hum1@src as a component of Red Hat Hardened Images
- grafana13.1-0:13.1.6-0.5.hum1@x86_64 as a component of Red Hat Hardened Images
- grafana13.1-0:13.1.6-0.6.hum1@aarch64 as a component of Red Hat Hardened Images
- grafana13.1-0:13.1.6-0.6.hum1@src as a component of Red Hat Hardened Images
- grafana13.1-0:13.1.6-0.6.hum1@x86_64 as a component of Red Hat Hardened Images
- grafana13.2-0:13.2.1-0.7.hum1@aarch64 as a component of Red Hat Hardened Images
- grafana13.2-0:13.2.1-0.7.hum1@src as a component of Red Hat Hardened Images
- grafana13.2-0:13.2.1-0.7.hum1@x86_64 as a component of Red Hat Hardened Images
- Action
- For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
- Workaround
- No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04
Evidence and provenance
Published 19 Sept 2026 · Last source change 21 Sept 2026, 20:47 UTC · CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source FIRST · tracked since 2026-09-20
?
The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.European sourceENISA EUVD · EUVD-2026-83586
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD not scheduled
Core structured fields are present and their contributing authorities are shown above.
Material change intelligence
View recent updates ↗What changed after publication
- Affected versionsThe structured affected or fixed version information changed.Red Hat Product Security ↗
- Before
- mta/mta-solution-server-rhel9 as a component of Migration Toolkit for Applications 8; ansible-automation-platform-27/mcp-server-rhel9 as a component of Red Hat Ansible Automation Platform 2; ansible-automation-platform-tech-preview/mcp-server-rhel9 as a component of Red Hat Ansible Automation Platform 2; grafana as a component of Red Hat Enterprise Linux 10; grafana-selinux as a component of Red Hat Enterprise Linux 10; grafana.src as a component of Red Hat Enterprise Linux 10; rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI); devspaces/code-rhel9 as a component of Red Hat OpenShift Dev Spaces · Fixed: grafana12.4-0:12.4.10-0.10.hum1@aarch64 as a component of Red Hat Hardened Images; grafana12.4-0:12.4.10-0.10.hum1@src as a component of Red Hat Hardened Images; grafana12.4-0:12.4.10-0.10.hum1@x86_64 as a component of Red Hat Hardened Images; grafana13.1-0:13.1.6-0.5.hum1@aarch64 as a component of Red Hat Hardened Images; grafana13.1-0:13.1.6-0.5.hum1@src as a component of Red Hat Hardened Images; grafana13.1-0:13.1.6-0.5.hum1@x86_64 as a component of Red Hat Hardened Images; grafana13.2-0:13.2.1-0.7.hum1@aarch64 as a component of Red Hat Hardened Images; grafana13.2-0:13.2.1-0.7.hum1@src as a component of Red Hat Hardened Images; grafana13.2-0:13.2.1-0.7.hum1@x86_64 as a component of Red Hat Hardened Images
- After
- mta/mta-solution-server-rhel9 as a component of Migration Toolkit for Applications 8; ansible-automation-platform-27/mcp-server-rhel9 as a component of Red Hat Ansible Automation Platform 2; ansible-automation-platform-tech-preview/mcp-server-rhel9 as a component of Red Hat Ansible Automation Platform 2; grafana as a component of Red Hat Enterprise Linux 10; grafana-selinux as a component of Red Hat Enterprise Linux 10; grafana.src as a component of Red Hat Enterprise Linux 10; rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI); devspaces/code-rhel9 as a component of Red Hat OpenShift Dev Spaces · Fixed: grafana12.4-0:12.4.10-0.10.hum1@aarch64 as a component of Red Hat Hardened Images; grafana12.4-0:12.4.10-0.10.hum1@src as a component of Red Hat Hardened Images; grafana12.4-0:12.4.10-0.10.hum1@x86_64 as a component of Red Hat Hardened Images; grafana13.1-0:13.1.6-0.5.hum1@aarch64 as a component of Red Hat Hardened Images; grafana13.1-0:13.1.6-0.5.hum1@src as a component of Red Hat Hardened Images; grafana13.1-0:13.1.6-0.5.hum1@x86_64 as a component of Red Hat Hardened Images; grafana13.1-0:13.1.6-0.6.hum1@aarch64 as a component of Red Hat Hardened Images; grafana13.1-0:13.1.6-0.6.hum1@src as a component of Red Hat Hardened Images; grafana13.1-0:13.1.6-0.6.hum1@x86_64 as a component of Red Hat Hardened Images; grafana13.2-0:13.2.1-0.7.hum1@aarch64 as a component of Red Hat Hardened Images; grafana13.2-0:13.2.1-0.7.hum1@src as a component of Red Hat Hardened Images; grafana13.2-0:13.2.1-0.7.hum1@x86_64 as a component of Red Hat Hardened Images
- Affected versionsThe structured affected or fixed version information changed.Red Hat Product Security ↗
- Before
- mta/mta-solution-server-rhel9 as a component of Migration Toolkit for Applications 8; ansible-automation-platform-27/mcp-server-rhel9 as a component of Red Hat Ansible Automation Platform 2; ansible-automation-platform-tech-preview/mcp-server-rhel9 as a component of Red Hat Ansible Automation Platform 2; grafana as a component of Red Hat Enterprise Linux 10; grafana-selinux as a component of Red Hat Enterprise Linux 10; grafana.src as a component of Red Hat Enterprise Linux 10; grafana12.4.src as a component of Red Hat Hardened Images; grafana13.1.src as a component of Red Hat Hardened Images; rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI); devspaces/code-rhel9 as a component of Red Hat OpenShift Dev Spaces · Fixed: grafana13.2-0:13.2.1-0.7.hum1@aarch64 as a component of Red Hat Hardened Images; grafana13.2-0:13.2.1-0.7.hum1@src as a component of Red Hat Hardened Images; grafana13.2-0:13.2.1-0.7.hum1@x86_64 as a component of Red Hat Hardened Images
- After
- mta/mta-solution-server-rhel9 as a component of Migration Toolkit for Applications 8; ansible-automation-platform-27/mcp-server-rhel9 as a component of Red Hat Ansible Automation Platform 2; ansible-automation-platform-tech-preview/mcp-server-rhel9 as a component of Red Hat Ansible Automation Platform 2; grafana as a component of Red Hat Enterprise Linux 10; grafana-selinux as a component of Red Hat Enterprise Linux 10; grafana.src as a component of Red Hat Enterprise Linux 10; rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI); devspaces/code-rhel9 as a component of Red Hat OpenShift Dev Spaces · Fixed: grafana12.4-0:12.4.10-0.10.hum1@aarch64 as a component of Red Hat Hardened Images; grafana12.4-0:12.4.10-0.10.hum1@src as a component of Red Hat Hardened Images; grafana12.4-0:12.4.10-0.10.hum1@x86_64 as a component of Red Hat Hardened Images; grafana13.1-0:13.1.6-0.5.hum1@aarch64 as a component of Red Hat Hardened Images; grafana13.1-0:13.1.6-0.5.hum1@src as a component of Red Hat Hardened Images; grafana13.1-0:13.1.6-0.5.hum1@x86_64 as a component of Red Hat Hardened Images; grafana13.2-0:13.2.1-0.7.hum1@aarch64 as a component of Red Hat Hardened Images; grafana13.2-0:13.2.1-0.7.hum1@src as a component of Red Hat Hardened Images; grafana13.2-0:13.2.1-0.7.hum1@x86_64 as a component of Red Hat Hardened Images
- Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-93981 to remediation: access.redhat.com/CVE-2026-93981.Red Hat Product Security ↗
- Before
- remediation: access.redhat.com/CVE-2026-93981
- After
- remediation: access.redhat.com/CVE-2026-93981
- Remediation statusRemediation status changed from Awaiting fix to Patch available.Red Hat Product Security ↗
- Before
- Awaiting fix
- After
- Patch available
- Affected versionsThe structured affected or fixed version information changed.Red Hat Product Security ↗
- Before
- mta/mta-solution-server-rhel9 as a component of Migration Toolkit for Applications 8; ansible-automation-platform-27/mcp-server-rhel9 as a component of Red Hat Ansible Automation Platform 2; ansible-automation-platform-tech-preview/mcp-server-rhel9 as a component of Red Hat Ansible Automation Platform 2; grafana as a component of Red Hat Enterprise Linux 10; grafana-selinux as a component of Red Hat Enterprise Linux 10; grafana.src as a component of Red Hat Enterprise Linux 10; grafana12.4.src as a component of Red Hat Hardened Images; grafana13.1.src as a component of Red Hat Hardened Images; grafana13.2.src as a component of Red Hat Hardened Images; rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI); devspaces/code-rhel9 as a component of Red Hat OpenShift Dev Spaces
- After
- mta/mta-solution-server-rhel9 as a component of Migration Toolkit for Applications 8; ansible-automation-platform-27/mcp-server-rhel9 as a component of Red Hat Ansible Automation Platform 2; ansible-automation-platform-tech-preview/mcp-server-rhel9 as a component of Red Hat Ansible Automation Platform 2; grafana as a component of Red Hat Enterprise Linux 10; grafana-selinux as a component of Red Hat Enterprise Linux 10; grafana.src as a component of Red Hat Enterprise Linux 10; grafana12.4.src as a component of Red Hat Hardened Images; grafana13.1.src as a component of Red Hat Hardened Images; rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI); devspaces/code-rhel9 as a component of Red Hat OpenShift Dev Spaces · Fixed: grafana13.2-0:13.2.1-0.7.hum1@aarch64 as a component of Red Hat Hardened Images; grafana13.2-0:13.2.1-0.7.hum1@src as a component of Red Hat Hardened Images; grafana13.2-0:13.2.1-0.7.hum1@x86_64 as a component of Red Hat Hardened Images
- ENISA EUVD mappingEUVD-2026-83586 was added to the official ENISA EUVD mapping for this CVE.ENISA EUVD ↗
- Before
- not recorded
- After
- {"euvdId":"EUVD-2026-83586"}
- Catalogue recordCVE added to the BlackTree catalogue.CNA ↗
CVE published
Fixed release or patch reference recorded
Technical terms and abbreviations used in this report
- CVE
- Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
- CVSS
- Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
- EPSS
- Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
- CWE
- Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
- CNA
- CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
- CISA ADP
- Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
- NVD
- National Vulnerability Database: NIST's enrichment service for CVE records.
- CERT / CSIRT
- A computer security incident response team that publishes warnings or coordinates incident response.
- PoC
- Proof of concept: public material that demonstrates or helps reproduce exploitation.
- CSAF
- Common Security Advisory Framework: a machine-readable format for security advisories.
- LoTL
- Living off the land: abuse of legitimate tools or system functions during an attack.