Evidence used
- No CISA KEV confirmation is currently recorded.
- A structured source references public exploit or proof-of-concept material.
- EPSS is 0.43% for the current model date.
BlackTreeCVE IntelligenceFull vulnerability report · 2026
CVE-2026-42349High confidence
Clerk: Authorization bypass when combining organization, billing, or reverification checks
clerk · javascript
Official source article: GitHub GHSA-W24R-5266-9C3C ↗. Check the applicable product and release in the original source.
7.6HighCVSS 4.0
Within 7 days
Mitigation availableHigh technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.
R
Open reassessment dashboard →Operational reassessment
Published severity in operational context
Published severityHigh→Operational priority:Critical, raised one band.upgradedsince 14 May 2026
Compensating controls
- Apply the linked authoritative mitigation while planning the permanent fix.
- 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
- Confirm that the asset runs clerk javascript and falls inside the recorded affected range.
- Recheck the vendor advisory before scheduling a change because no verified fixed version is currently retained.
- 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 ranges58 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 |
|---|---|---|---|
| npm@clerk/astro | >= 2.0.0, <= 2.17.10 | 2.17.11 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/astro | >= 3.0.0, <= 3.0.17 | 3.0.18 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/astro | SEMVER: introduced 2.0.0; fixed 2.17.11 | 2.17.11 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/astro | SEMVER: introduced 3.0.0; fixed 3.0.18 | 3.0.18 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/backend | >= 2.0.0, <= 2.33.2 | 2.33.3 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/backend | >= 3.0.0, <= 3.2.13 | 3.2.14 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/backend | SEMVER: introduced 2.0.0; fixed 2.33.3 | 2.33.3 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/backend | SEMVER: introduced 3.0.0; fixed 3.2.14 | 3.2.14 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/chrome-extension | >= 1.3.5, <= 2.9.14 | 2.9.15 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/chrome-extension | >= 3.0.0, <= 3.1.14 | 3.1.15 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/chrome-extension | SEMVER: introduced 1.3.5; fixed 2.9.15 | 2.9.15 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/chrome-extension | SEMVER: introduced 3.0.0; fixed 3.1.15 | 3.1.15 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/clerk-expo | >= 2.2.11, <= 2.19.35 | 2.19.36 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/clerk-expo | SEMVER: introduced 2.2.11; fixed 2.19.36 | 2.19.36 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/clerk-js | >= 5.22.0, <= 5.125.9 | 5.125.10 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/clerk-js | >= 6.0.0, <= 6.7.4 | 6.7.5 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/clerk-js | SEMVER: introduced 5.22.0; fixed 5.125.10 | 5.125.10 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/clerk-js | SEMVER: introduced 6.0.0; fixed 6.7.5 | 6.7.5 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/clerk-react | >= 5.9.0, <= 5.61.5 | 5.61.6 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/clerk-react | SEMVER: introduced 5.9.0; fixed 5.61.6 | 5.61.6 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/expo | >= 3.0.0, <= 3.2.1 | 3.2.2 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/expo | SEMVER: introduced 3.0.0; fixed 3.2.2 | 3.2.2 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/express | >= 0.1.0, <= 1.7.78 | 1.7.79 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/express | >= 2.0.0, <= 2.1.5 | 2.1.6 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/express | SEMVER: introduced 0.1.0; fixed 1.7.79 | 1.7.79 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/express | SEMVER: introduced 2.0.0; fixed 2.1.6 | 2.1.6 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/fastify | >= 1.0.42, <= 2.6.30 | 2.6.31 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/fastify | >= 3.0.0, <= 3.1.15 | 3.1.16 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/fastify | SEMVER: introduced 1.0.42; fixed 2.6.31 | 2.6.31 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/fastify | SEMVER: introduced 3.0.0; fixed 3.1.16 | 3.1.16 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/hono | >= 0.0.2, <= 0.1.15 | 0.1.16 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/hono | SEMVER: introduced 0.0.2; fixed 0.1.16 | 0.1.16 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/nextjs | >= 6.0.0, <= 6.39.2 | 6.39.3 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/nextjs | >= 7.0.0, <= 7.2.3 | 7.2.4 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/nextjs | SEMVER: introduced 6.0.0; fixed 6.39.3 | 6.39.3 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/nextjs | SEMVER: introduced 7.0.0; fixed 7.2.4 | 7.2.4 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/nuxt | >= 1.0.0, <= 1.13.28 | 1.13.29 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/nuxt | >= 2.0.0, <= 2.2.4 | 2.2.5 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/nuxt | SEMVER: introduced 1.0.0; fixed 1.13.29 | 1.13.29 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/nuxt | SEMVER: introduced 2.0.0; fixed 2.2.5 | 2.2.5 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/react | >= 6.0.0, <= 6.4.2 | 6.4.3 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/react | SEMVER: introduced 6.0.0; fixed 6.4.3 | 6.4.3 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/react-router | >= 0.0.1, <= 2.4.12 | 2.4.13 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/react-router | >= 3.0.0, <= 3.1.3 | 3.1.4 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/react-router | SEMVER: introduced 0.0.1; fixed 2.4.13 | 2.4.13 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/react-router | SEMVER: introduced 3.0.0; fixed 3.1.4 | 3.1.4 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/shared | >= 3.0.0, <= 3.47.4 | 3.47.5 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/shared | >= 4.0.0, <= 4.8.2 | 4.8.3 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/shared | SEMVER: introduced 3.0.0; fixed 3.47.5 | 3.47.5 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/shared | SEMVER: introduced 4.0.0; fixed 4.8.3 | 4.8.3 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/tanstack-react-start | >= 0.0.1, <= 0.29.10 | 0.29.11 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/tanstack-react-start | >= 1.0.0, <= 1.1.3 | 1.1.4 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/tanstack-react-start | SEMVER: introduced 0.0.1; fixed 0.29.11 | 0.29.11 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/tanstack-react-start | SEMVER: introduced 1.0.0; fixed 1.1.4 | 1.1.4 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/vue | >= 1.0.0, <= 1.17.20 | 1.17.21 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/vue | >= 2.0.0, <= 2.0.15 | 2.0.16 | GitHub advisory ↗upstream repository advisory · 9 Jun 2026 |
| npm@clerk/vue | SEMVER: introduced 1.0.0; fixed 1.17.21 | 1.17.21 | OSV record ↗aggregator derived · 10 Sep 2026 |
| npm@clerk/vue | SEMVER: introduced 2.0.0; fixed 2.0.16 | 2.0.16 | OSV record ↗aggregator derived · 10 Sep 2026 |
High technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.
Mitigation available01
What, why and how
Clerk JavaScript is the official JavaScript repository for Clerk authentication. has(), auth.protect(), and related authorization predicates in @clerk/shared, @clerk/nextjs, @clerk/backend, and other framework SDKs can return true for certain combined authorization checks when the result should be false, allowing a gated action to proceed for a user who does not satisfy the full set of requested conditions. This call shape can be bypassed if certain conditions are met: a has() or auth.protect() call that combines a reverification check with any of role, permission, feature, or plan, or that combines a billing check (feature or plan) with a role or permission check. This vulnerability is fixed in @clerk/clerk-js 5.125.10 and 6.7.5.
What
Clerk JavaScript is the official JavaScript repository for Clerk authentication. has(), auth.protect(), and related authorization predicates in @clerk/shared, @clerk/nextjs, @clerk/backend, and other framework SDKs can return true for certain combined authorization checks when the result should be false, allowing a gated action to proceed for a user who does not satisfy the full set of requested conditions. This call shape can be bypassed if certain conditions are met: a has() or auth.protect() call that combines a reverification check with any of role, permission, feature, or plan, or that combines a billing check (feature or plan) with a role or permission check. This vulnerability is fixed in @clerk/clerk-js 5.125.10 and 6.7.5.
Why
The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.
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
Clerk JavaScript is the official JavaScript repository for Clerk authentication. has(), auth.protect(), and related authorization predicates in @clerk/shared, @clerk/nextjs, @clerk/backend, and other framework SDKs can return true for certain combined authorization checks when the result should be false, allowing a gated action to proceed for a user who does not satisfy the full set of requested conditions. This call shape can be bypassed if certain conditions are met: a has() or auth.protect() call that combines a reverification check with any of role, permission, feature, or plan, or that combines a billing check (feature or plan) with a role or permission check. This vulnerability is fixed in @clerk/clerk-js 5.125.10 and 6.7.5.
Why
The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.
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 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 Reference recorded
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.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 Check for Unusual or Exceptional Conditions → 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
- None
- Attack complexity
- Low: no specialised conditions are recorded
- Security boundary
- Not a CVSS 4.0 base metric
- Weakness
?
CWE means Common Weakness Enumeration: a standard category for the underlying weakness. - CWE-754 ↗
CWE-754: Improper Check for Unusual or Exceptional Conditions. The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.
- 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:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/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.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.ATPresentAttack requirements: A particular deployment or execution condition must be present.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.VCHighVulnerable-system confidentiality: A successful attack can cause a major loss.VIHighVulnerable-system integrity: A successful attack can cause a major loss.VANoneVulnerable-system availability: No direct loss is represented by this metric.SCNoneSubsequent-system confidentiality: No direct loss is represented by this metric.SINoneSubsequent-system integrity: No direct loss is represented by this metric.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. - Mitigation available
- Affected
- javascript: >= 5.22.0, < 5.125.10, >= 6.0.0, < 6.7.5
- shared: >= 3.0.0, <= 3.47.4, >= 4.0.0, <= 4.8.2
- backend: >= 2.0.0, <= 2.33.2, >= 3.0.0, <= 3.2.13
- nextjs: >= 6.0.0, <= 6.39.2, >= 7.0.0, <= 7.2.3
- clerk-react: >= 5.9.0, <= 5.61.5
- react: >= 6.0.0, <= 6.4.2
- vue: >= 1.0.0, <= 1.17.20, >= 2.0.0, <= 2.0.15
- astro: >= 2.0.0, <= 2.17.10, >= 3.0.0, <= 3.0.17
- nuxt: >= 1.0.0, <= 1.13.28, >= 2.0.0, <= 2.2.4
- clerk-expo: >= 2.2.11, <= 2.19.35
- expo: >= 3.0.0, <= 3.2.1
- react-router: >= 0.0.1, <= 2.4.12, >= 3.0.0, <= 3.1.3
- tanstack-react-start: >= 0.0.1, <= 0.29.10, >= 1.0.0, <= 1.1.3
- chrome-extension: >= 1.3.5, <= 2.9.14, >= 3.0.0, <= 3.1.14
- fastify: >= 1.0.42, <= 2.6.30, >= 3.0.0, <= 3.1.15
- express: >= 0.1.0, <= 1.7.78, >= 2.0.0, <= 2.1.5
- hono: >= 0.0.2, <= 0.1.15
- Action
- Apply the mitigation in the linked authoritative guidance while planning the vendor's permanent fix.
- Workaround
- A mitigation or workaround reference is available from the source linked below; validate it against the affected product and version.
04
Evidence and provenance
Published 11 May 2026 · Last source change 14 May 2026, 18:19 UTC · CWE-754 · Improper Check for Unusual or Exceptional Conditions
CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source FIRST · tracked since 2026-08-14
?
The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.European sourceENISA EUVD · EUVD-2026-29125
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceCNA
NVD statusNVD enriched
Core structured fields are present and their contributing authorities are shown above.
Material change intelligence
View recent updates ↗What changed after publication
No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.
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.