CVE-2026-56774 Details
Description
Kanboard through 1.2.52, fixed in commit 928c68a, UserViewController::removeSession fails to validate the session id parameter before passing it to RememberMeSessionModel::remove, allowing authenticated users to delete other users' Remember Me sessions. Attackers can enumerate sequential session IDs and mass-invalidate persistent login sessions of any user, including administrators, forcing re-authentication and causing denial of service.
A vulnerability exists in Kanboard versions through 1.2.52 in the UserViewController::removeSession method. The issue arises because the session ID parameter is not properly validated before being passed to the RememberMeSessionModel::remove method. This flaw allows authenticated users to delete the 'Remember Me' sessions of other users, including administrators. Attackers can exploit this by enumerating sequential session IDs to invalidate persistent login sessions en masse, forcing users to re-authenticate and causing a denial-of-service effect.
Users can update to Kanboard version 1.2.53 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jun 25, 2026CISA-ADP
Assessed Jun 25, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/kanboard/kanboard/commit/928c68aa2b7c00092dd71084d329b912e229f3d1 | [email protected] | Source CodeVendor |
| https://github.com/kanboard/kanboard/issues/5829 | [email protected] | Issue TrackingTechnical DescriptionVendor |
| https://github.com/kanboard/kanboard/pull/5831 | [email protected] | Source CodeVendor |
| https://www.vulncheck.com/advisories/kanboard-cross-user-deletion-of-persistent-login-sessions-via-unvalidated-session-id | [email protected] | AdvisoryRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-639 | Authorization Bypass Through User-Controlled Key | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Kanboard | <= 1.2.52 (semver) |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 14, 2026 | CVE Modified | [email protected] |
| Jun 25, 2026 | CVE Modified | CISA-ADP |
| Jun 25, 2026 | New CVE Received | [email protected] |