What is CVE-2026-104439?

CVE-2026-104439 is a medium-severity vulnerability in Yeswiki, classified under Observable Response Discrepancy. CVSS score: 5.3/10. Published 2026-10-02.

How severe is CVE-2026-104439?

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

Vulnerability in Yeswiki

CVE-2026-104439

YesWiki before 4.6.7 contains a user enumeration vulnerability in LostPasswordAction.php that allows unauthenticated attackers to confirm registered email addresses through differing responses. Attackers can submit emails to the MotDePassePerdu recovery page without rate limiting to identify valid accounts for targeted phishing or password-spraying.

Published 2026-10-02 · last modified 2026-10-02.

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

Yeswiki

Weakness classification (CWE)

CWE-204 — Observable Response Discrepancy

References

github.com/YesWiki/yeswiki/security/advisories/GHSA-892r-45m6-45xc (vendor-advisory)
www.vulncheck.com/advisories/yeswiki-before-4.6.7-user-enumeration-via-lost-pas… (third-party-advisory)

Frequently asked questions

What is CVE-2026-104439?: CVE-2026-104439 is a medium-severity vulnerability in Yeswiki, classified under Observable Response Discrepancy. CVSS score: 5.3/10. Published 2026-10-02.
How severe is CVE-2026-104439?: Medium severity. CVSS v3 base score is 5.3 out of 10.