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CVE-2026-67351 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:6.8 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

CNA: [email protected]CVSS-B:8.8 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/s9y/Serendipity/security/advisories/GHSA-v645-243f-jwgh	CISA-ADP	AdvisoryExploitRemedyVendor
https://github.com/s9y/Serendipity/security/advisories/GHSA-v645-243f-jwgh	[email protected]	AdvisoryExploitRemedyVendor
https://www.vulncheck.com/advisories/serendipity-authentication-bypass-via-username-collision	[email protected]	Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-304	Missing Critical Step in Authentication	[email protected]

Affected Products

Product	Versions
Serendipity	<= 2.6.0 (semver)
CPE cpe:2.3:a:s9y:serendipity:::::::: Remediation Upgrade: 2.6.1moderate effort

Change History

2 change records found show changes

Date	Action	Recorded By
Jul 31, 2026	CVE Modified	CISA-ADP
Jul 30, 2026	New CVE Received	[email protected]