CVE-2026-42349 [High] | Security Bypass in Clerk\/astro

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.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-02	0.05%	0.05%	-0.01%
2	2026-05-12	—	0.05%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-02

0.05%

-0.01%

2026-05-12

—

0.05%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.6	4.0	HIGH	`CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network. Attack complexity (AC:L) Exploitation conditions are straightforward and stable. Attack requirements (AT:P) Additional preconditions must be present for exploitation. Privileges required (PR:L) Low privileges are required. User interaction (UI:N) No user interaction is required. Vulnerable system confidentiality impact (VC:H) High confidentiality impact on the vulnerable system. Vulnerable system integrity impact (VI:H) High integrity impact on the vulnerable system. Vulnerable system availability impact (VA:N) No availability impact on the vulnerable system. Subsequent system confidentiality impact (SC:N) No confidentiality impact on subsequent systems. Subsequent system integrity impact (SI:N) No integrity impact on subsequent systems. Subsequent system availability impact (SA:N) No availability impact on subsequent systems. Exploit maturity (threat) (E:X) Not defined: no reliable threat intelligence; scoring assumes the worst case (equivalent to Attacked). Confidentiality requirement (CR:X) Not defined: insufficient information; scoring treats this like High (worst case). Integrity requirement (IR:X) Not defined: insufficient information; scoring treats this like High (worst case). Availability requirement (AR:X) Not defined: insufficient information; scoring treats this like High (worst case). Modified attack vector (MAV:X) Not defined: scoring uses the Base Attack Vector (AV). Modified attack complexity (MAC:X) Not defined: scoring uses the Base Attack Complexity (AC). Modified attack requirements (MAT:X) Not defined: scoring uses the Base Attack Requirements (AT). Modified privileges required (MPR:X) Not defined: scoring uses the Base Privileges Required (PR). Modified user interaction (MUI:X) Not defined: scoring uses the Base User Interaction (UI). Modified vulnerable system confidentiality impact (MVC:X) Not defined: scoring uses the Base VC metric. Modified vulnerable system integrity impact (MVI:X) Not defined: scoring uses the Base VI metric. Modified vulnerable system availability impact (MVA:X) Not defined: scoring uses the Base VA metric. Modified subsequent system confidentiality impact (MSC:X) Not defined: scoring uses the Base SC metric. Modified subsequent system integrity impact (MSI:X) Not defined: scoring uses the Base SI metric. Modified subsequent system availability impact (MSA:X) Not defined: scoring uses the Base SA metric. Safety (supplemental) (S:X) Not evaluated. Automatable (supplemental) (AU:X) Not evaluated. Recovery (supplemental) (R:X) Not evaluated. Value density (supplemental) (V:X) Not evaluated. Vulnerability response effort (supplemental) (RE:X) Not evaluated. Provider urgency (supplemental) (U:X) Not evaluated.	—	—	[email protected]
8.1	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:N) Service keeps running; no real outage angle.	2.8	5.2	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.6

4.0

HIGH

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network.
Attack complexity (AC:L): Exploitation conditions are straightforward and stable.
Attack requirements (AT:P): Additional preconditions must be present for exploitation.
Privileges required (PR:L): Low privileges are required.
User interaction (UI:N): No user interaction is required.
Vulnerable system confidentiality impact (VC:H): High confidentiality impact on the vulnerable system.
Vulnerable system integrity impact (VI:H): High integrity impact on the vulnerable system.
Vulnerable system availability impact (VA:N): No availability impact on the vulnerable system.
Subsequent system confidentiality impact (SC:N): No confidentiality impact on subsequent systems.
Subsequent system integrity impact (SI:N): No integrity impact on subsequent systems.
Subsequent system availability impact (SA:N): No availability impact on subsequent systems.
Exploit maturity (threat) (E:X): Not defined: no reliable threat intelligence; scoring assumes the worst case (equivalent to Attacked).
Confidentiality requirement (CR:X): Not defined: insufficient information; scoring treats this like High (worst case).
Integrity requirement (IR:X): Not defined: insufficient information; scoring treats this like High (worst case).
Availability requirement (AR:X): Not defined: insufficient information; scoring treats this like High (worst case).
Modified attack vector (MAV:X): Not defined: scoring uses the Base Attack Vector (AV).
Modified attack complexity (MAC:X): Not defined: scoring uses the Base Attack Complexity (AC).
Modified attack requirements (MAT:X): Not defined: scoring uses the Base Attack Requirements (AT).
Modified privileges required (MPR:X): Not defined: scoring uses the Base Privileges Required (PR).
Modified user interaction (MUI:X): Not defined: scoring uses the Base User Interaction (UI).
Modified vulnerable system confidentiality impact (MVC:X): Not defined: scoring uses the Base VC metric.
Modified vulnerable system integrity impact (MVI:X): Not defined: scoring uses the Base VI metric.
Modified vulnerable system availability impact (MVA:X): Not defined: scoring uses the Base VA metric.
Modified subsequent system confidentiality impact (MSC:X): Not defined: scoring uses the Base SC metric.
Modified subsequent system integrity impact (MSI:X): Not defined: scoring uses the Base SI metric.
Modified subsequent system availability impact (MSA:X): Not defined: scoring uses the Base SA metric.
Safety (supplemental) (S:X): Not evaluated.
Automatable (supplemental) (AU:X): Not evaluated.
Recovery (supplemental) (R:X): Not evaluated.
Value density (supplemental) (V:X): Not evaluated.
Vulnerability response effort (supplemental) (RE:X): Not evaluated.
Provider urgency (supplemental) (U:X): Not evaluated.

—

[email protected]

8.1

3.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N): Service keeps running; no real outage angle.

2.8

5.2

[email protected]

Affected software / configurations for CVE-2026-42349

Vendor	Product	Version	Raw CPE
clerk	clerk\/astro	>= 2.0.0, < 2.17.11	cpe:2.3:a:clerk:clerk\/astro::::::node.js::*
clerk	clerk\/astro	>= 3.0.0, < 3.0.18	cpe:2.3:a:clerk:clerk\/astro::::::node.js::*
clerk	clerk\/backend	>= 2.0.0, < 2.33.3	cpe:2.3:a:clerk:clerk\/backend::::::node.js::*
clerk	clerk\/backend	>= 3.0.0, < 3.2.14	cpe:2.3:a:clerk:clerk\/backend::::::node.js::*
clerk	clerk\/chrome-extension	>= 1.3.5, < 2.9.15	cpe:2.3:a:clerk:clerk\/chrome-extension::::::node.js::*
clerk	clerk\/chrome-extension	>= 3.0.0, < 3.1.15	cpe:2.3:a:clerk:clerk\/chrome-extension::::::node.js::*
clerk	clerk\/clerk-expo	>= 2.2.11, < 2.19.36	cpe:2.3:a:clerk:clerk\/clerk-expo::::::node.js::*
clerk	clerk\/clerk-js	>= 5.22.0, < 5.125.10	cpe:2.3:a:clerk:clerk\/clerk-js::::::node.js::*
clerk	clerk\/clerk-js	>= 6.0.0, < 6.7.5	cpe:2.3:a:clerk:clerk\/clerk-js::::::node.js::*
clerk	clerk\/clerk-react	>= 5.9.0, < 5.61.6	cpe:2.3:a:clerk:clerk\/clerk-react::::::node.js::*
clerk	clerk\/expo	>= 3.0.0, < 3.2.2	cpe:2.3:a:clerk:clerk\/expo::::::node.js::*
clerk	clerk\/express	>= 0.1.0, < 1.7.79	cpe:2.3:a:clerk:clerk\/express::::::node.js::*
clerk	clerk\/express	>= 2.0.0, < 2.1.6	cpe:2.3:a:clerk:clerk\/express::::::node.js::*
clerk	clerk\/fastify	>= 1.0.42, < 2.6.31	cpe:2.3:a:clerk:clerk\/fastify::::::node.js::*
clerk	clerk\/fastify	>= 3.0.0, < 3.1.16	cpe:2.3:a:clerk:clerk\/fastify::::::node.js::*
clerk	clerk\/hono	>= 0.0.2, < 0.1.16	cpe:2.3:a:clerk:clerk\/hono::::::node.js::*
clerk	clerk\/nextjs	>= 6.0.0, <= 6.39.3	cpe:2.3:a:clerk:clerk\/nextjs::::::node.js::*
clerk	clerk\/nextjs	>= 7.0.0, < 7.2.4	cpe:2.3:a:clerk:clerk\/nextjs::::::node.js::*
clerk	clerk\/nuxt	>= 1.0.0, < 1.13.29	cpe:2.3:a:clerk:clerk\/nuxt::::::node.js::*
clerk	clerk\/nuxt	>= 2.0.0, < 2.2.5	cpe:2.3:a:clerk:clerk\/nuxt::::::node.js::*
clerk	clerk\/react	>= 6.0.0, < 6.4.3	cpe:2.3:a:clerk:clerk\/react::::::node.js::*
clerk	clerk\/react-router	>= 0.0.1, < 2.4.13	cpe:2.3:a:clerk:clerk\/react-router::::::node.js::*
clerk	clerk\/react-router	>= 3.0.0, < 3.1.4	cpe:2.3:a:clerk:clerk\/react-router::::::node.js::*
clerk	clerk\/shared	>= 3.0.0, < 3.47.5	cpe:2.3:a:clerk:clerk\/shared::::::node.js::*
clerk	clerk\/shared	>= 4.0.0, < 4.8.3	cpe:2.3:a:clerk:clerk\/shared::::::node.js::*
clerk	clerk\/tanstack-react-start	>= 0.0.1, < 0.29.11	cpe:2.3:a:clerk:clerk\/tanstack-react-start::::::node.js::*
clerk	clerk\/tanstack-react-start	>= 1.0.0, < 1.1.4	cpe:2.3:a:clerk:clerk\/tanstack-react-start::::::node.js::*
clerk	clerk\/vue	>= 1.0.0, < 1.17.21	cpe:2.3:a:clerk:clerk\/vue::::::node.js::*
clerk	clerk\/vue	>= 2.0.0, < 2.0.16	cpe:2.3:a:clerk:clerk\/vue::::::node.js::*

References for CVE-2026-42349

URL	Tags
https://github.com/clerk/javascript/security/advisories/GHSA-w24r-5266-9c3c	Mitigation Vendor Advisory

URL

CVE-2026-42349 | Clerk: Authorization bypass when combining organization, billing, or reverification checks

Exploit prediction scoring system (EPSS) score for CVE-2026-42349

Common vulnerability scoring system (CVSS) metrics for CVE-2026-42349

Weakness enumeration for CVE-2026-42349

GitHub Security Advisory for CVE-2026-42349

Affected software / configurations for CVE-2026-42349

References for CVE-2026-42349