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TI-2026-76103 Aliases CVE-2026-111895GHSA-r5w3-grm8-fh38

phpMyFAQ Entra ID login allows account takeover via preferred_username

Priority HIGH 68CWE-287Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
High
Attack requirements
Present
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-287.

Summary

phpMyFAQ from 3.2.0 before 4.0.0 and from 4.0.2 before 4.2.0-beta has an authentication bypass in its Microsoft Entra ID login flow. The flow links users by the mutable preferred_username claim and continues with the existing local account when a duplicate login occurs, without applying the duplicate-login exception. An attacker who controls an Entra identity in the configured tenant with a matching preferred_username can take over that local account, including super-admin accounts. This is classified as CWE-287.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

phpMyFAQ 3.2.0 before 4.0.0 and 4.0.2 before 4.2.0-beta contains an authentication bypass in its Microsoft Entra ID login flow, which links users by the mutable preferred_username claim and whose AuthEntraId::create() ignores the duplicate-login exception while continuing with the existing local account. Attackers controlling an Entra identity in the configured tenant with a matching preferred_username can take over that local account, including super-admin accounts.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00371 31st percentileScored 2026-11-07
Fix Fixed phpMyFAQ (thorsten): 4.0.0, 4.2.0-beta

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
thorstenphpMyFAQ3.2.0 to before 4.0.04.0.0Patch availableCNA
thorstenphpMyFAQ4.0.2 to before 4.2.0-beta4.2.0-betaPatch availableCNA
  • phpMyFAQ Vendorthorsten Affected 3.2.0 to before 4.0.0 Fixed in 4.0.0 Patch available CNA
  • phpMyFAQ Vendorthorsten Affected 4.0.2 to before 4.2.0-beta Fixed in 4.2.0-beta Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:phpmyfaq:phpmyfaq:*:*:*:*:*:*:*:*——thorsten
  • cpe:2.3:a:phpmyfaq:phpmyfaq:*:*:*:*:*:*:*:* Versions — — ·thorsten

Remediation

The fixed version is 4.0.0 for the 3.2.0 before 4.0.0 range and 4.2.0-beta for the 4.0.2 before 4.2.0-beta range.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA phpMyFAQ (thorsten) Fixed in 4.0.0
  • Fix · CNA phpMyFAQ (thorsten) Fixed in 4.2.0-beta

Fixed in the same release

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

  • Release ·

    thorsten phpMyFAQ 4.2.0-beta

    24 records Highest priority Priority HIGH 10 HIGH, 10 MEDIUM, 4 LOW

    Other records, highest priority first

    • TI-2026-76108 Unauthenticated denial of service in phpMyFAQ API paginationPriority HIGH 77
    • TI-2026-76115 Authorization bypass in phpMyFAQ REST API edits restricted FAQsPriority HIGH 73
    • TI-2026-76092 phpMyFAQ e-mail change lacks password check, enabling takeoverPriority HIGH 73
    Show all 24 records →

Timeline

  1. 2026-10-18 Threatist record created from CVE-2026-111895
  2. 2026-10-18 Alias added: GHSA-r5w3-grm8-fh38
  3. 2026-10-18 Priority changed: MEDIUM → LOW
  4. 2026-10-19 CISA SSVC decision points changed
  5. 2026-10-19 Priority changed: LOW → HIGH

References

Advisory 1

  • TI-2023-00296 Improper Authentication in thorsten/phpmyfaq CVSS 3.1CRITICAL 9.8
  • TI-2026-76118 Authentication bypass in phpMyFAQ via WebAuthn credential injection CVSS 4.0CRITICAL 9.3
  • TI-2026-32868 phpMyFAQ - Unauthenticated Two-Factor Authentication Brute-Force via /admin/check Endpoint CVSS 4.0CRITICAL 9.3
  • TI-2026-76108 Unauthenticated denial of service in phpMyFAQ API pagination CVSS 4.0HIGH 8.7
  • TI-2026-53313 phpMyFAQ 3.1.0 through 4.1.6 Authentication Bypass via LDAP CVSS 4.0HIGH 8.8
  • TI-2026-34083 phpMyFAQ - Unauthenticated Information Disclosure via getIdFromSolutionId Permission Bypass CVSS 4.0HIGH 8.7
See all 224 →

Sources

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