HTTP Response Splitting Affecting adminer package, versions <5.4.3+dfsg-1


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.43% (36th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-ADMINER-18067273
  • published21 Jul 2026
  • disclosed20 Jul 2026

Introduced: 20 Jul 2026

CVE-2026-63771  (opens in a new tab)
CWE-113  (opens in a new tab)

How to fix?

Upgrade Debian:unstable adminer to version 5.4.3+dfsg-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream adminer package and not the adminer package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

Adminer before 5.4.3 contains a cookie injection vulnerability that allows attackers to manipulate cookie attributes by injecting arbitrary values through the unsanitized X-Forwarded-Prefix HTTP header used in Set-Cookie path attributes. Attackers can exploit a misconfigured reverse proxy to downgrade SameSite protection and enable cross-origin authenticated requests, bypassing cookie security controls.

CVSS Base Scores

version 3.1