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

CVE-2025-3894Stored XSS in MegaBIP

Medium 4.8

In plain English

A medium-severity cross-site scripting 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 0.4% (higher than 39% of all known vulnerabilities).

Severity (CVSS 4.0)4.8Medium

Exploit odds (30 days)0.4%top 61.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Text editor embedded into MegaBIP software does not neutralize user input allowing Stored XSS attacks on other users. In order to use the editor high privileges are required. Version 5.20 of MegaBIP fixes this issue.

Affected products (as reported)

Vendor	Product	Versions
Jan Syski	MegaBIP	0 – through 5.19

Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/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