Vulnerability-Lookup

GHSA-X283-48FH-HC5W

Vulnerability from github – Published: 2026-09-04 12:30 – Updated: 2026-09-04 12:30

Details

phpMyFAQ before 4.1.8 contains an authentication bypass vulnerability in its two-factor authentication (TOTP) disable functionality. The removeTwofactorConfig() handler (reachable via POST /api/user/remove-twofactor) verifies only that the user is logged in and that a valid CSRF token is supplied, then disables TOTP without requiring password re-entry or a current TOTP code. The same downgrade is also reachable inline via PUT /api/user/data/update, which accepts a plain twofactor_enabled form field under the same session+CSRF-only guard. An attacker who has hijacked a user's session can silently strip two-factor protection from any account, including administrator accounts, after which password-only authentication succeeds.

Severity

7.1 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-85590"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-308"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-04T12:17:21Z",
    "severity": "HIGH"
  },
  "details": "phpMyFAQ before 4.1.8 contains an authentication bypass vulnerability in its two-factor authentication (TOTP) disable functionality. The removeTwofactorConfig() handler (reachable via POST /api/user/remove-twofactor) verifies only that the user is logged in and that a valid CSRF token is supplied, then disables TOTP without requiring password re-entry or a current TOTP code. The same downgrade is also reachable inline via PUT /api/user/data/update, which accepts a plain twofactor_enabled form field under the same session+CSRF-only guard. An attacker who has hijacked a user\u0027s session can silently strip two-factor protection from any account, including administrator accounts, after which password-only authentication succeeds.",
  "id": "GHSA-x283-48fh-hc5w",
  "modified": "2026-09-04T12:30:59Z",
  "published": "2026-09-04T12:30:59Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-h96g-59xp-7r5m"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-85590"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/phpmyfaq-before-4.1.8-authentication-bypass-via-two-factor-disable"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-85590 (GCVE-0-2026-85590)

Vulnerability from cvelistv5 – Published: 2026-09-04 11:29 – Updated: 2026-09-04 14:01

Title

phpMyFAQ before 4.1.8 Authentication Bypass via Two-Factor Disable

Summary

Severity

7.1 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-04 13:58 UTC

CWE

CWE-308 - Use of Single-factor Authentication

Assigner

VulnCheck mitre root

References

2 references

URL	Tags
https://github.com/thorsten/phpMyFAQ/security/adv…	vendor-advisory
https://www.vulncheck.com/advisories/phpmyfaq-bef…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
thorsten	phpMyFAQ	Affected: 0 , < 4.1.8 (semver) Unaffected: 4.1.8 (semver) cpe:2.3:a:phpmyfaq:phpmyfaq::::::::

Date Public

2026-08-20 00:00

Credits

skeletonsec

Show details on NVD website

JSON

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    "adp": [
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        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-85590",
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                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-04T13:58:27.504529Z",
                "version": "2.0.3"
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      ],
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-X283-48FH-HC5W

CVE-2026-85590 (GCVE-0-2026-85590)

Tags

Sightings

Nomenclature