# CVE-2026-63771

## Summary

- **CVE ID:** CVE-2026-63771
- **Severity:** MEDIUM
- **CVSS Score:** 7.1 (CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-113
- **Published:** Jul 20, 2026
- **Last Modified:** Jul 28, 2026

## 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.

## Affected Products

- vrana — adminer (0)

## References

- [CNA](https://github.com/vrana/adminer/issues/1298)
- [CNA](https://github.com/vrana/adminer/security/advisories/GHSA-c533-9qwm-8w5h)
- [CNA](https://github.com/vrana/adminer/releases#release-v5.4.3)
- [CNA](https://www.vulncheck.com/advisories/adminer-cookie-injection-via-x-forwarded-prefix-header)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.43%
- **EPSS Percentile:** 36.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._