CVE-2026-67351
Serendipity < 2.6.1 Authentication Bypass via Username Collision
- State
- Published
- Severity
- 8.7 High
- Published
- Jul 30, 2026
- Updated
- Jul 31, 2026
- Reserved
- Jul 29, 2026
Description
Serendipity before 2.6.1 contains an authentication context confusion vulnerability where password validation and session loading operate independently without ensuring both use the same user record. An authenticated Editor can create a username collision with an Administrator account and obtain administrative privileges by logging in with their own password while the session loads the Administrator's account data.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 8.8 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-304 Missing Critical Step in Authentication
Affected Products
| Product | Versions |
|---|---|
Serendipitys9y |
|
References
- GitHub Security Advisory (GHSA-v645-243f-jwgh)vendor-advisory
- https://www.vulncheck.com/advisories/serendipity-authentication-bypass-via-username-collisionthird-party-advisory
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