CVE-2025-3895: Low token entropy in MegaBIP

Severity: critical (CVSS 9.1 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-23 · updated 2026-06-17
Weakness: CWE-334

Description

Token used for resetting passwords in MegaBIP software are generated using a small space of random values combined with a queryable value. It allows an unauthenticated attacker who know user login names to brute force these tokens and change account passwords (including these belonging to administrators). Version 5.20 of MegaBIP fixes this issue.

Affected products

Jan Syski MegaBIP: through 5.19

References

https://cert.pl/en/posts/2025/05/CVE-2025-3893
https://megabip.pl/index.php?id=24,145
https://www.gov.pl/web/cyfryzacja/rekomendacja-pelnomocnika-rzadu-ds-cyberbezpieczenstwa-dotyczaca-biuletynow-informacji-publicznej

Get alerted when CVE-2025-3895 or the next vulnerability affects your stack