CVE-2026-25561
Published: 07 February 2026
Summary
CVE-2026-25561 is a high-severity Incorrect Authorization (CWE-863) vulnerability in Wekan Project Wekan. Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 2.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Threat & Defense at a Glance
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Periodic review and update of procedures reduces incorrect authorization implementations over time.
Supervision identifies cases where authorization logic incorrectly permits unauthorized actions.
Defining permitted attribute values and auditing modifications reduces the chance of incorrect authorization outcomes due to tampered or missing labels.
The authorization process and usage restrictions help prevent incorrect authorization for remote access types.
Establishing configuration and connection requirements helps ensure correct rather than incorrect authorization for wireless access.
Establishing connection authorization processes for mobile devices helps ensure authorization decisions are correctly implemented rather than incorrect.
Monitoring account use, notifying on changes, and reviewing accounts for compliance corrects incorrect authorization assignments.
Ensures authorization decisions for external system use are correctly implemented and enforced.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Authorization bypass in public-facing WeKan web app directly enables remote exploitation via T1190; resulting ability to associate attachments with arbitrary objects enables stored data manipulation/pollution via T1565.001.
NVD Description
WeKan versions prior to 8.19 contain an authorization weakness in the attachment upload API. The API does not fully validate that provided identifiers (such as boardId, cardId, swimlaneId, and listId) are consistent and refer to a coherent card/board relationship, enabling…
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attempts to upload attachments with mismatched object relationships.
Deeper analysisAI
CVE-2026-25561, published on 2026-02-07, affects WeKan versions prior to 8.19 and stems from an authorization weakness (CWE-863) in the attachment upload API. The API fails to fully validate that provided identifiers—such as boardId, cardId, swimlaneId, and listId—are consistent and refer to a coherent card/board relationship. This flaw enables attackers to upload attachments using mismatched object relationships. The vulnerability has a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N), highlighting its network accessibility, low attack complexity, and high integrity impact.
Unauthenticated remote attackers (PR:N) can exploit this issue over the network without user interaction. By supplying inconsistent identifiers during attachment uploads, they bypass intended authorization checks, allowing attachments to be associated with arbitrary boards, cards, swimlanes, or lists. This results in a high integrity impact (I:H), potentially enabling unauthorized data manipulation or pollution within WeKan instances.
Mitigation requires upgrading to WeKan version 8.19 or later, where the issue is addressed via the fix in GitHub commit 1d16955b6d4f0a0282e89c2c1b0415c7597019b8. Further details on the vulnerability and remediation are provided in the VulnCheck advisory at https://www.vulncheck.com/advisories/wekan-attachment-upload-object-relationship-validation-bypass and on the WeKan website at https://wekan.fi/.
Details
- CWE(s)