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Kanboard CVE-2026-56774

| EUVDEUVD-2026-39526 MEDIUM
Authorization Bypass Through User-Controlled Key (CWE-639)
2026-06-25 VulnCheck GHSA-vvjm-mjq4-27c8
Authentication Bypass Denial Of Service Kanboard
5.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
5.3 MEDIUM
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
5.4 MEDIUM

Network-accessible endpoint requires a low-privilege authenticated account (PR:L); no confidentiality impact; session deletion yields minor integrity and availability degradation only.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

2
Source Code Evidence Fetched
Jun 25, 2026 - 18:58 vuln.today
Analysis Generated
Jun 25, 2026 - 18:58 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Authenticated session hijacking via IDOR in Kanboard through 1.2.52 allows any low-privilege user to mass-invalidate the persistent 'Remember Me' sessions of arbitrary users, including administrators, by enumerating sequential integer session IDs against the unguarded removeSession endpoint. The root-cause fix - scoping RememberMeSessionModel::remove() to the requesting user's own user_id - is confirmed in commit 928c68a via PR #5831. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate with low-privilege Kanboard account
Delivery
Observe own Remember Me session ID from HTTP traffic
Exploit
Enumerate sequential integer IDs via removeSession endpoint
Execution
Delete arbitrary users' persistent sessions
Impact
Force administrator and user re-authentication
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Vulnerability AssessmentAI

Exploitation Exploitation requires a valid authenticated Kanboard account with at minimum low-privilege access - unauthenticated exploitation is not possible per the CVSS PR:L designation. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N - score 5.3 Medium) accurately reflects the threat model: network-accessible, low complexity, requiring only a valid low-privilege account. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An authenticated low-privilege Kanboard user inspects their browser's network traffic to identify their own Remember Me session ID after login, discovering it is a small sequential integer. The attacker then scripts a loop issuing DELETE-equivalent requests to the `removeSession` endpoint across a range of IDs (e.g., 1-10000), invalidating persistent sessions for all users including administrators. …
Remediation Update Kanboard to a build that includes commit 928c68aa2b7c00092dd71084d329b912e229f3d1 (PR #5831, https://github.com/kanboard/kanboard/pull/5831); self-hosted instances should pull from the patched HEAD or await a tagged release from the vendor. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-56774 vulnerability details – vuln.today
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