CVE-2026-63771 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-63771MEDIUM

vrana adminer — Adminer < 5.4.3 Cookie Injection via X-Forwarded-Prefix Header

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   P   N   P   H   L   N    6.0   .0024   15.8     —

AFFECTED
  Product  Versions     Fixed
  adminer  unspecified  —

TIMELINE
  Jul 18  Reserved by VulnCheck
  Jul 20  Published (CNA: VulnCheck)
  Jul 21  EXPLOIT PUBLISHED — CVE-2026-63771 (vrana adminer). Public exploit reference added.
  Jul 27  EXPLOIT PUBLISHED — CVE-2026-63771 (vrana adminer). Public exploit reference added.

CWE-113 · CNA: VulnCheck · CVSS v4.0 · 4 references · NVD status: Deferred

Description

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.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
July 18, 2026	Reserved	Reserved by VulnCheck
July 20, 2026	Published	Published (CNA: VulnCheck)
July 21, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-63771 (vrana adminer). Public exploit reference added.
July 27, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-63771 (vrana adminer). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
vrana	adminer	—	—	—

Weaknesses

CWE-113

References (4)

https://github.com/vrana/adminer/issues/1298 [technical-description, exploit, issue-tracking]
https://github.com/vrana/adminer/releases#release-v5.4.3 [release-notes]
https://github.com/vrana/adminer/security/advisories/GHSA-c533-9qwm-8w5h [vendor-advisory]
https://www.vulncheck.com/advisories/adminer-cookie-injection-via-x-forwarded-prefix-header [third-party-advisory]

Authoritative record: CVE-2026-63771 at cve.org

Vendors: vrana

Weaknesses: CWE-113

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-63771 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.