CVE-2026-104439 YesWiki before 4.6.7 User Enumeration via Lost-Password Flow
Unauthenticated attackers can enumerate registered email addresses via the lost-password flow, facilitating targeted phishing or password-spraying attacks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-104439?
CVE-2026-104439 is a high-severity vulnerability in yeswiki, published on 2 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-204
Which versions are affected by CVE-2026-104439?
How do I fix CVE-2026-104439?
No fix has been published for CVE-2026-104439 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-104439 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104439 exists.
Sources
Also known as GHSA-892r-45m6-45xc, GHSA-q8mj-q84p-cx6f.