CVE-2026-56774

Kanboard - Cross-User Deletion of Persistent Login Sessions via Unvalidated Session ID

CVSS 5.3 MEDIUMEPSS 0.3%CWE-639

Vexday Risk Score

33Attention

SSVC decision (CISA)

Attend

PoC available → attend closely

CVSS 5.3EPSS 0.3%KEV nãoPoC públicaNuclei —Metasploit —Patch referenciado

Lifecycle

25 Jun 2026Published on NVD

Recommendation: Plan a near-term fix — a public PoC already exists.

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.

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

Affected products

kanboard · kanboard

public PoCs found — 1

cve_referencegithub.com/kanboard/kanboard/issues/5829unverified

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

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References

https://github.com/kanboard/kanboard/commit/928c68aa2b7c00092dd71084d329b912e229f3d1 https://github.com/kanboard/kanboard/issues/5829 https://github.com/kanboard/kanboard/pull/5831 https://www.vulncheck.com/advisories/kanboard-cross-user-deletion-of-persistent-login-sessions-via-unvalidated-session-id