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.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00266.

Exploitation poc

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
kanboard kanboard unaffected
Version Status Constraints
0 affected ≤ 1.2.52
928c68aa2b7c00092dd71084d329b912e229f3d1 unaffected —

No data.

No data.

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Vendors Products
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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

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

Thu, 25 Jun 2026 22:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 25 Jun 2026 22:00:00 +0000

Type Values Removed Values Added
First Time appeared Kanboard
Kanboard kanboard
Vendors & Products Kanboard
Kanboard kanboard

Thu, 25 Jun 2026 18:30:00 +0000

Type Values Removed Values Added
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.
Title Kanboard - Cross-User Deletion of Persistent Login Sessions via Unvalidated Session ID
Weaknesses CWE-639
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L'}

cvssV4_0

{'score': 5.3, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-06-25T21:33:28.578Z

Reserved: 2026-06-23T01:22:22.571Z

Link: CVE-2026-56774

cve-icon Vulnrichment

Updated: 2026-06-25T20:30:44.600Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-25T21:45:15Z

Weaknesses