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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.

PUBLISHED Reserved 2026-06-23 | Published 2026-06-25 | Updated 2026-06-25 | Assigner VulnCheck




MEDIUM: 5.3CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N

MEDIUM: 5.4CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

Problem types

Authorization Bypass Through User-Controlled Key

Product status

Default status
unaffected

Any version
affected

928c68aa2b7c00092dd71084d329b912e229f3d1 (git)
unaffected

Credits

George Chen finder

References

github.com/kanboard/kanboard/issues/5829 (Researcher Disclosure) technical-description exploit

github.com/kanboard/kanboard/pull/5831 (Pull Request) issue-tracking

github.com/...ommit/928c68aa2b7c00092dd71084d329b912e229f3d1 (Patch Commit) patch

www.vulncheck.com/...gin-sessions-via-unvalidated-session-id third-party-advisory

cve.org (CVE-2026-56774)

nvd.nist.gov (CVE-2026-56774)

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