What is CVE-2026-111887?

CVE-2026-111887 is a medium-severity vulnerability in Thorsten Phpmyfaq, classified under Observable Response Discrepancy. CVSS score: 5.3/10. Published 2026-10-17.

How severe is CVE-2026-111887?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Thorsten Phpmyfaq

CVE-2026-111887

phpMyFAQ before 4.1.9 and 4.2.0-alpha before 4.2.0-beta contains an account enumeration vulnerability that allows unauthenticated attackers to confirm registered display names and emails via a distinct HTTP 409 response. Attackers can submit guest comments to the comment create endpoint with candidate user and mail values to link names to emails for targeted phishing.

Published 2026-10-17 · last modified 2026-10-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Thorsten Phpmyfaq

Weakness classification (CWE)

CWE-204 — Observable Response Discrepancy

References

github.com/thorsten/phpMyFAQ/security/advisories/GHSA-pgxw-7c68-83w7 (vendor-advisory)
www.vulncheck.com/advisories/phpmyfaq-before-4.1.9-and-4.2.0-alpha-before-4.2.0… (third-party-advisory)

Frequently asked questions

What is CVE-2026-111887?: CVE-2026-111887 is a medium-severity vulnerability in Thorsten Phpmyfaq, classified under Observable Response Discrepancy. CVSS score: 5.3/10. Published 2026-10-17.
How severe is CVE-2026-111887?: Medium severity. CVSS v3 base score is 5.3 out of 10.