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Full vulnerability report · 2026
CVE-2026-53606High confidence

sanitize-html has an incomplete URI scheme validation that allows javascript: URIs through action, formaction, data, poster, and background attributes

apostrophecms · sanitize-html

Official source article: GitHub GHSA-VCCV-CMXP-4J9H ↗. Check the applicable product and release in the original source.

5.4MediumCVSS 3.1
Recommended action
Within 7 days

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Fix not verified
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:High, raised one band.upgradedsince 15 Jun 2026

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • A structured source references public exploit or proof-of-concept material.
  • EPSS is 0.23% for the current model date.

Compensating controls

  • Restrict the affected network interface to trusted sources where business-safe.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs apostrophecms sanitize-html and falls inside the recorded affected range.
  2. Recheck the vendor advisory before scheduling a change because no verified fixed version is currently retained.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 30 daysRemediation target: Within 180 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Open-source package ranges1 source-attributed range

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 packageAffected rangeFirst fixed versionEvidence
npmsanitize-html>= 1.18.0, <= 2.17.42.17.5GitHub advisory ↗upstream repository advisory · 31 Jul 2026
Direct vendor intelligence

Authoritative 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.

2 current
CVE-2026-53606 · CSAF 2.0 · revision 4 · interimSUSE Product Security TeamCVE-2026-53606
24 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • golang-github-prometheus-prometheus as component of SUSE Linux Enterprise Module for Package Hub 15 SP7
  • golang-github-prometheus-prometheus as component of SUSE Linux Enterprise Server 16.0
  • golang-github-prometheus-prometheus as component of SUSE Linux Enterprise Server for SAP applications 16.0
  • golang-github-prometheus-prometheus as component of SUSE Manager Client Tools for SLE 15
  • SUSE Multi Linux Manager Tools SLE-15:firewalld-prometheus-config
  • SUSE Multi Linux Manager Tools SLE-15:golang-github-prometheus-prometheus
  • SUSE Multi Linux Manager Tools SLE-15:grafana
  • SUSE Multi Linux Manager Tools SLE-15:mgr-push
  • SUSE Multi Linux Manager Tools SLE-15:mgrctl
  • SUSE Multi Linux Manager Tools SLE-15:mgrctl-bash-completion
  • SUSE Multi Linux Manager Tools SLE-15:mgrctl-lang
  • SUSE Multi Linux Manager Tools SLE-15:mgrctl-zsh-completion
Summary
ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. Versions of sanitize-html prior to 2.17.5 use `allowedSchemesAppliedToAttributes` (default: `['href', 'src', 'cite']`) to gate the `naughtyHref()` function that blocks dangerous URI schemes like `javascript:` and `vbscript:`. The HTML specification defines 10+ attributes that accept URIs (`action`, `formaction`, `data`, `poster`, `background`, `ping`, `xlink:href`, `dynsrc`, `lowsrc`), but none of these are included in the default gate list. When a developer allows any of these attributes in their configuration, `javascript:` URIs pass through completely unmodified, enabling XSS. Version 2.17.5 patches the issue.
Remediation
No remediation text is recorded.
CVE-2026-53606 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityapostrophecms sanitize-html: sanitize-html: Cross-Site Scripting (XSS) via insufficient URI scheme validation
18 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • multicluster-engine/console-mce-rhel9 as a component of Multicluster Engine for Kubernetes
  • network-observability/network-observability-console-plugin-rhel9 as a component of Network Observability Operator
  • rhacm2/console-rhel9 as a component of Red Hat Advanced Cluster Management for Kubernetes 2
  • rhdh/rhdh-hub-rhel9 as a component of Red Hat Developer Hub
  • rhoai/odh-mlflow-rhel9 as a component of Red Hat OpenShift AI (RHOAI)
  • openshift3/ose-console as a component of Red Hat OpenShift Container Platform 4
  • openshift4/ose-agent-installer-ui-rhel9 as a component of Red Hat OpenShift Container Platform 4
  • openshift4/ose-console as a component of Red Hat OpenShift Container Platform 4
  • openshift4/ose-console-rhel9 as a component of Red Hat OpenShift Container Platform 4
  • devspaces/dashboard-rhel9 as a component of Red Hat OpenShift Dev Spaces
  • openshift-gitops-1/console-plugin-rhel8 as a component of Red Hat OpenShift GitOps
  • container-native-virtualization/kubevirt-console-plugin-rhel9 as a component of Red Hat OpenShift Virtualization 4
Summary
A flaw was found in sanitize-html, an HTML sanitizer library. This vulnerability allows a remote attacker to perform Cross-Site Scripting (XSS) attacks. The issue occurs because the sanitizer does not properly validate dangerous URI schemes, such as javascript:, when they are used in certain HTML attributes like action or data. This oversight enables an attacker to inject malicious scripts into web pages, which can then be executed in the victim's browser.
Remediation
If upgrading is not possible, add non standard attributes (including `action`, `formaction`, `data`, `poster`, and `background`) to your `allowedSchemesAppliedToAttributes` configuration so the URI scheme filter covers them. You can also remove them from `allowedAttributes` if your application does not need them.
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-36574

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Fix not verified
01

What, why and how

ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. Versions of sanitize-html prior to 2.17.5 use `allowedSchemesAppliedToAttributes` (default: `['href', 'src', 'cite']`) to gate the `naughtyHref()` function that blocks dangerous URI schemes like `javascript:` and `vbscript:`. The HTML specification defines 10+ attributes that accept URIs (`action`, `formaction`, `data`, `poster`, `background`, `ping`, `xlink:href`, `dynsrc`, `lowsrc`), but none of these are included in the default gate list. When a developer allows any of these attributes in their configuration, `javascript:` URIs pass through completely unmodified, enabling XSS. Version 2.17.5 patches the issue.

What

ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. Versions of sanitize-html prior to 2.17.5 use `allowedSchemesAppliedToAttributes` (default: `['href', 'src', 'cite']`) to gate the `naughtyHref()` function that blocks dangerous URI schemes like `javascript:` and `vbscript:`. The HTML specification defines 10+ attributes that accept URIs (`action`, `formaction`, `data`, `poster`, `background`, `ping`, `xlink:href`, `dynsrc`, `lowsrc`), but none of these are included in the default gate list. When a developer allows any of these attributes in their configuration, `javascript:` URIs pass through completely unmodified, enabling XSS. Version 2.17.5 patches the issue.

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 with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. Versions of sanitize-html prior to 2.17.5 use `allowedSchemesAppliedToAttributes` (default: `['href', 'src', 'cite']`) to gate the `naughtyHref()` function that blocks dangerous URI schemes like `javascript:` and `vbscript:`. The HTML specification defines 10+ attributes that accept URIs (`action`, `formaction`, `data`, `poster`, `background`, `ping`, `xlink:href`, `dynsrc`, `lowsrc`), but none of these are included in the default gate list. When a developer allows any of these attributes in their configuration, `javascript:` URIs pass through completely unmodified, enabling XSS. Version 2.17.5 patches the issue.

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 with low privileges. 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
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

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
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

CISA Vulnrichment records proof-of-concept exploitation in its SSVC data. BlackTree has not independently executed or validated exploit material.

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
Low: a basic authenticated account is required
User interaction
Required interaction required
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Changed: exploitation can affect a different security authority
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:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UIRequiredUser interaction: Another user must perform an action for exploitation to succeed.SChangedScope: The attack can affect a component governed by a different security authority.CLowConfidentiality impact: A successful attack can cause a limited loss.ILowIntegrity impact: A successful attack can cause a limited loss.ANoneAvailability impact: 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.
NetworkCWE-79Public exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

BSI · German · WID-SEC-2026-2488IBM App Connect Enterprise: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in IBM App Connect Enterprise ausnutzen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Dateien zu manipulieren, um einen Cross-Site Scripting Angriff durchzuführen, und um Sicherheitsvorkehrungen zu umgehen.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1256Multiples vulnérabilités dans les produits IBM

d?id=CVE-2026-53185 Référence CVE CVE-2026-53189 https://www.cve.org/CVERecord?id=CVE-2026-53189 Référence CVE CVE-2026-53329 https://www.cve.org/CVERecord?id=CVE-2026-53329 Référence CVE CVE-2026-53374 https://www.cve.org/CVERecord?id=CVE-2026-53374 Référence CVE CVE-2026-53391 https://www.cve.org/CVERecord?id=CVE-2026-53391 Référence CVE CVE-2026-53392 https://www.cve.org/CVERecord?id=CVE-2026-53392 Référence CVE CVE-2026-53397 https://www.cve.org/CVERecord?id=CVE-2026-53397 Référence CVE CVE-2026-53399 https://www.cve.org/CVERecord?id=CVE-2026-53399 Référence CVE CVE-2026-53550 https://www.cve.org/CVERecord?id=CVE-2026-53550 Référence CVE CVE-2026-53606 https://www.cve.org/CVERecord?id=CVE-2026-53606 Référence CVE CVE-2026-53655 https://www.cve.org/CVERecord?id=CVE-2026-53655 Référence CVE CVE-2026-54371 https://www.cve.org/CVERecord?id=CVE-2026-54371 Référence CVE CVE-2026-54411 https://www.cve.org/CVERecord?id=CVE-2026-54411 Référence CVE CVE-2026-54512 https://www.cve.org/CVERecord?id=CVE-2026-54512 Référence CVE CVE-2026-54513 https://www.cve.org/CVERecord?id=CVE-2026-54513 Référence CVE CVE-2026-54514 https://www.cve.org/CVERecord?id=CVE-2026-54514 Référence CVE CVE-2026-54515 https://www.cve.org/CVERecord?id=CVE-2026-54515 Référence CVE CVE-2026-54516 https://www.cve.org/CVERecord?id=

Official advisory ↗
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.
Fix not verified
Affected
  • golang-github-prometheus-prometheus as component of SUSE Linux Enterprise Module for Package Hub 15 SP7
  • golang-github-prometheus-prometheus as component of SUSE Linux Enterprise Server 16.0
  • golang-github-prometheus-prometheus as component of SUSE Linux Enterprise Server for SAP applications 16.0
  • golang-github-prometheus-prometheus as component of SUSE Manager Client Tools for SLE 15
  • SUSE Multi Linux Manager Tools SLE-15:firewalld-prometheus-config
  • SUSE Multi Linux Manager Tools SLE-15:golang-github-prometheus-prometheus
  • SUSE Multi Linux Manager Tools SLE-15:grafana
  • SUSE Multi Linux Manager Tools SLE-15:mgr-push
  • SUSE Multi Linux Manager Tools SLE-15:mgrctl
  • SUSE Multi Linux Manager Tools SLE-15:mgrctl-bash-completion
  • SUSE Multi Linux Manager Tools SLE-15:mgrctl-lang
  • SUSE Multi Linux Manager Tools SLE-15:mgrctl-zsh-completion
  • SUSE Multi Linux Manager Tools SLE-15:python3-mgr-push
  • SUSE Multi Linux Manager Tools SLE-15:python3-spacewalk-client-tools
  • SUSE Multi Linux Manager Tools SLE-15:spacecmd
  • SUSE Multi Linux Manager Tools SLE-15:spacewalk-client-tools
  • SUSE Multi Linux Manager Tools SLE-15:venv-salt-minion
  • SUSE Multi Linux Manager Tools SLE-Micro-5:mgrctl
  • SUSE Multi Linux Manager Tools SLE-Micro-5:mgrctl-bash-completion
  • SUSE Multi Linux Manager Tools SLE-Micro-5:mgrctl-lang
  • SUSE Multi Linux Manager Tools SLE-Micro-5:mgrctl-zsh-completion
  • SUSE Multi Linux Manager Tools SLE-Micro-5:venv-salt-minion
  • golang-github-prometheus-prometheus as component of SUSE Multi-Linux Manager Client Tools for SLE 15
  • golang-github-prometheus-prometheus as component of openSUSE Leap 16.0
Fixed
No fixed version is explicitly recorded in the structured CVE data.
Action
No verified patch reference is present in the current structured sources. Check the vendor advisory before making a change.
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 12 Jun 2026 · Last source change 15 Jun 2026, 17:54 UTC · CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-36574
Product sourceVendor CSAF · SUSE Product Security Team
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

What changed after publication

View recent updates ↗

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
ENISA EUVD · EUVD-2026-36574↗Vendor CSAF · SUSE Product Security Team↗CISA Vulnrichment SSVC evidence↗CVE authority or vendor reference · GitHub GHSA-VCCV-CMXP-4J9H↗Official CVE record (CNA and ADP data)↗NVD record↗
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.
Free version - for non-commercial use only.CVE-2026-53606 · cve.blacktree.nl