CVE-2026-42300

CRITICAL

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

Title source: cna
STIX 2.1

Description

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.

Scores

CVSS v4 9.3
EPSS 0.0026
EPSS Percentile 16.8%
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/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

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact total

Details

CWE
CWE-288
Status published
Products (2)
l3montree-dev/devguard 0 - 1.2.2Go
l3montree-dev/devguard < 1.2.2
Published May 12, 2026
Tracked Since May 13, 2026