CVE-2009-20001 MantisBT Insufficient Session Expiration cookie string not reset after logout

What is CVE-2009-20001?

CVE-2009-20001 is a high-severity authentication bypass vulnerability in Mantisbt Mantisbt, published on 7 Mar 2021. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

An issue was discovered in MantisBT before 2.24.5. It associates a unique cookie string with each user. This string is not reset upon logout (i.e., the user session is still considered valid and active), allowing an attacker who somehow gained access to a user's cookie to login as them.

Weakness: CWE-613

Which versions are affected by CVE-2009-20001?

2 open source packages ship an affected version, including mantisbt/mantisbt. It affects 1 product.

Products include Mantisbt Mantisbt.

How do I fix CVE-2009-20001?

Upgrade mantisbt/mantisbt to 2.24.5 or later.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2009-20001 being exploited?

There is no known exploitation of CVE-2009-20001 in the wild and no public exploit code.

Other vulnerabilities in Mantisbt Mantisbt

• CVE-2019-15074 MantisBT allows cross-site scripting (XSS) via crafted filename Critical 9.6
• CVE-2026-30849 MantisBT SOAP API has an authentication bypass vulnerability on MySQL Critical 9.3
• CVE-2025-47776 MantisBT: Authentication bypass for some passwords due to PHP type juggling High 8.8
• CVE-2017-7615 MantisBT allows arbitrary password reset High 8.8
• CVE-2026-33517 MantisBT Vulnerable to Stored HTML Injection in Tag Delete Confirmation High 8.6

All Mantisbt Mantisbt vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-jm72-67rm-763j.