CVE-2026-42300 CRITICAL

CVE-2026-42300: DevGuard: Unauthenticated identity assertion via `X-Admin-Token` header

Vendor L3Montree-Dev
Product devguard
Weakness CWE-288
Published May 12, 2026
Last update May 13, 2026

CVSS base score

9.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

What the vulnerability does

01Description

DevGuard provides vulnerability management for the full software supply chain. Prior to 1.2.2, the SessionMiddleware accepts a client-supplied X-Admin-Token HTTP request header and uses its raw string value as the authenticated userID when no Kratos session cookie is present. An unauthenticated attacker who knows or can guess a target user's Kratos identity UUID can issue requests as that user. Where the target user is an organisation admin or owner, this gives the attacker full control over that organisation's DevGuard resources. This vulnerability is fixed in 1.2.2.

Key dates

02Disclosure timeline

May 12, 2026 CVE published
May 13, 2026 Record updated