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TI-2026-27181 Aliases CVE-2026-34959GHSA-fh9x-8h7v-rwhv

Adminer before 5.5.0 Open Redirect via X-Forwarded-Prefix

Priority MEDIUM 57CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Adminer 4.6.0 before 5.5.0 prepends the client-supplied X-Forwarded-Prefix header to $_SERVER["REQUEST_URI"] with no trusted-proxy check and no validation of the prefix value. An attacker can supply an absolute URL (e.g. X-Forwarded-Prefix: https://evil.example) that flows into Location redirect headers, the Set-Cookie path attribute, and self-referential links. This enables an authenticated open redirect after state-changing POSTs, unauthenticated control of the session cookie path attribute, and poisoning of self-referential links; CR/LF cannot be injected, so header splitting/XSS is not possible.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0029 21st percentileScored 2026-11-07
Fix Fixed adminer (vrana): 5.5.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Admineradminerbefore 5.5.05.5.0Patch availableCNA
  • adminer VendorAdminer Affected before 5.5.0 Fixed in 5.5.0 Patch available CNA

Remediation

  • Fix · CNA adminer (vrana) Fixed in 5.5.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    vrana adminer 5.5.0

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-27186 Adminer before 5.5.0 SSRF via PDO DSN InjectionPriority LOW 37
    Show all 2 records →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-34959
  2. 2026-10-03 Alias added: GHSA-fh9x-8h7v-rwhv
  3. 2026-11-06 Affected versions changed · Red Hat
  4. 2026-11-06 CVSS score added · Red Hat

References

Advisory 1

  • TI-2021-04411 SSRF in adminer KEVCVSS 3.1HIGH 7.2
  • TI-2026-40884 Adminer before 5.4.3 Remote Code Execution via MSSQL PDO DSN Injection CVSS 4.0CRITICAL 9.3
  • TI-2026-71163 Remote code execution in Adminer via UTF-8 BOM SQLite bypass CVSS 4.0HIGH 8.6
  • TI-2026-40882 Adminer before 5.4.3 Remote Code Execution via SQLite VACUUM INTO CVSS 4.0HIGH 8.6
  • TI-2026-64854 Adminer before 6.0.2 Privileged-Port SSRF via host_port Regex CVSS 4.0MEDIUM 6.9
  • TI-2026-64852 Adminer before 6.0.2 Unauthenticated SSRF via Elasticsearch Driver CVSS 4.0MEDIUM 6.9
See all 26 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences