CVE-2026-42280: CWE-863: Incorrect Authorization in auth0 auth0.js
A vulnerability exists in Auth0.js versions 8.11.0 through 9.32.0 where, under specific conditions, the SDK may improperly return user profile information when presented with a valid access token and a specifically crafted invalid ID token. This incorrect authorization issue is identified as CWE-863 and is fixed in version 10.0.0. The vulnerability has a CVSS score of 7.
AI Analysis
Technical Summary
CVE-2026-42280 is an incorrect authorization vulnerability in the Auth0.js client-side JavaScript library. Between versions 8.11.0 and 9.32.0, the SDK may improperly return user profile information when a valid access token is used alongside a specifically crafted invalid ID token. This flaw allows unauthorized access to user profile data under certain conditions. The issue is resolved in Auth0.js version 10.0.0. The vulnerability is classified under CWE-863 and has a CVSS 3.1 base score of 7.1, reflecting a high-severity security impact with network attack vector, low attack complexity, and no user interaction required.
Potential Impact
The vulnerability can lead to unauthorized disclosure of user profile information when an attacker provides a valid access token and a crafted invalid ID token. This compromises confidentiality (high impact) but has limited impact on integrity (low) and no impact on availability. There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade Auth0.js to version 10.0.0 or later, where this vulnerability is fixed. Since the vulnerability is in a client-side library, applying the official fix by updating the SDK version is the recommended remediation. Patch status is not explicitly confirmed beyond the fix in version 10.0.0, so verify with vendor advisories for any additional guidance.
CVE-2026-42280: CWE-863: Incorrect Authorization in auth0 auth0.js
Description
A vulnerability exists in Auth0.js versions 8.11.0 through 9.32.0 where, under specific conditions, the SDK may improperly return user profile information when presented with a valid access token and a specifically crafted invalid ID token. This incorrect authorization issue is identified as CWE-863 and is fixed in version 10.0.0. The vulnerability has a CVSS score of 7.
CVSS v3.1
Score 7.1high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-42280 is an incorrect authorization vulnerability in the Auth0.js client-side JavaScript library. Between versions 8.11.0 and 9.32.0, the SDK may improperly return user profile information when a valid access token is used alongside a specifically crafted invalid ID token. This flaw allows unauthorized access to user profile data under certain conditions. The issue is resolved in Auth0.js version 10.0.0. The vulnerability is classified under CWE-863 and has a CVSS 3.1 base score of 7.1, reflecting a high-severity security impact with network attack vector, low attack complexity, and no user interaction required.
Potential Impact
The vulnerability can lead to unauthorized disclosure of user profile information when an attacker provides a valid access token and a crafted invalid ID token. This compromises confidentiality (high impact) but has limited impact on integrity (low) and no impact on availability. There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade Auth0.js to version 10.0.0 or later, where this vulnerability is fixed. Since the vulnerability is in a client-side library, applying the official fix by updating the SDK version is the recommended remediation. Patch status is not explicitly confirmed beyond the fix in version 10.0.0, so verify with vendor advisories for any additional guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-26T11:53:27.717Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a170b54e29bf47b50c905f9
Added to database: 05/27/2026, 15:18:44 UTC
Last enriched: 06/03/2026, 20:47:36 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 51
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