Vulnerability · Published May 23, 2025 · Assigned by CERT-PL

CVE-2025-3895Low token entropy in MegaBIP

Critical 9.1

In plain English

A critical-severity security flaw in MegaBIP from Jan Syski. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities).

Severity (CVSS 4.0)9.1Critical

Exploit odds (30 days)0.5%top 56.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
Jan Syski	MegaBIP	0 – through 5.19

Weakness: CWE-334 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

References

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