What is CVE-2025-47776?

CVE-2025-47776 is a critical-severity vulnerability in Mantisbt, classified under Authentication Bypass by Primary Weakness. CVSS score: 9.1/10. Published 2025-11-04.

How severe is CVE-2025-47776?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Mantisbt

CVE-2025-47776

Mantis Bug Tracker (MantisBT) is an open source issue tracker. Due to incorrect use of loose (==) instead of strict (===) comparison in the authentication code in versions 2.27.1 and below.PHP type juggling will cause certain MD5 hashes matching scientific notation to be interpreted as numbers. Instances using the MD5 login method allow an attacker who knows the victim's username and has access to an account with a password hash that evaluates to zero to log in without knowing the victim's actual password, by using any other password with a hash that also evaluates to zero This issue is fixed in version 2.27.2.

EPSS: 0.003 (25.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Mantisbt — versions < 2.27.2

Weakness classification (CWE)

CWE-305 — Authentication Bypass by Primary Weakness

References

security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Issue Tracking, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2025-47776?: CVE-2025-47776 is a critical-severity vulnerability in Mantisbt, classified under Authentication Bypass by Primary Weakness. CVSS score: 9.1/10. Published 2025-11-04.
How severe is CVE-2025-47776?: Critical severity. CVSS v3 base score is 9.1 out of 10.