CVE-2024-55603 Insufficient session invalidation in Kanboard
Attackers can reuse expired sessions to maintain unauthorized access to Kanboard accounts due to insufficient session invalidation checks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2024-55603?
CVE-2024-55603 is a medium-severity authentication bypass vulnerability in kanboard, published on 18 Dec 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Kanboard is project management software that focuses on the Kanban methodology. In affected versions sessions are still usable even though their lifetime has exceeded. Kanboard implements a cutom session handler (`app/Core/Session/SessionHandler.php`), to store the session data in a database. Therefore, when a `session_id` is given, kanboard queries the data from the `sessions` sql table. At this point, it does not correctly verify, if a given `session_id` has already exceeded its lifetime (`expires_at`). Thus, a session which's lifetime is already `> time()`, is still queried from the database and hence a valid login. The implemented **SessionHandlerInterface::gc** function, that does remove invalid sessions, is called only **with a certain probability** (_Cleans up expired sessions. Called by `session_start()`, based on `session.gc_divisor`, `session.gc_probability` and `session.gc_maxlifetime` settings_) accordingly to the php documentation. In the official Kanboard docker image these values default to: session.gc_probability=1, session.gc_divisor=1000. Thus, an expired session is only terminated with probability 1/1000. This issue has been addressed in release 1.2.43 and all users are advised to upgrade. There are no known workarounds for this vulnerability.
Weakness: CWE-613
Which versions are affected by CVE-2024-55603?
It affects 1 product.
Products include Kanboard Kanboard.
How do I fix CVE-2024-55603?
No fix has been published for CVE-2024-55603 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2024-55603 being exploited?
There is no known exploitation of CVE-2024-55603 in the wild and no public exploit code.
Other vulnerabilities in kanboard
- CVE-2026-21881 Kanboard is Vulnerable to Reverse Proxy Authentication Bypass
- CVE-2025-55010 Kanboard Authenticated Admin Remote Code Execution via Unsafe Deserialization of Events
- CVE-2024-51747 Arbitrary File Read and Delete in kanboard
- CVE-2024-51748 Remote code execution through language setting in kanboard
- CVE-2017-12850 Business logic in n/a
Sources
Also known as GHSA-gv5c-8pxr-p484.