CVE-2026-1963
Published: 05 February 2026
Summary
CVE-2026-1963 is a medium-severity Incorrect Privilege Assignment (CWE-266) vulnerability in Wekan Project Wekan. Its CVSS base score is 5.3 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 23.9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 AC-3 (Access Enforcement) and AC-6 (Least Privilege).
Deeper analysis
CVE-2026-1963 is a vulnerability in WeKan open-source kanban board software versions up to 8.20, specifically affecting an unknown function within the file models/attachments.js of the Attachment Storage component. It stems from improper access controls (mapped to CWE-266 and CWE-284), allowing unauthorized manipulation of attachments. The issue carries a CVSS v3.1 base score of 6.3 (AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L), indicating medium severity with network accessibility and low attack complexity.
An authenticated attacker with low privileges can exploit this vulnerability remotely without user interaction. Successful exploitation enables limited impacts, including low-level disclosure of confidential information, modification of data, and denial of service on attachments, potentially compromising board data integrity in multi-user environments.
Mitigation is available via upgrade to WeKan version 8.21, which includes the fixing commit c413a7e860bc4d93fe2adcf82516228570bf382d. Security practitioners should prioritize updating the affected Attachment Storage component, with details in the WeKan GitHub repository, release notes, and related advisories.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-5526
Vulnerability details
A vulnerability was found in WeKan up to 8.20. This affects an unknown function of the file models/attachments.js of the component Attachment Storage. The manipulation results in improper access controls. The attack may be launched remotely. Upgrading to version 8.21…
more
mitigates this issue. The patch is identified as c413a7e860bc4d93fe2adcf82516228570bf382d. Upgrading the affected component is advised.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Improper access controls in public-facing WeKan web app enable remote exploitation by low-priv authenticated users for unauthorized attachment data manipulation.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly enforces approved authorizations on attachment operations in models/attachments.js, blocking the unauthorized manipulation described in the CVE.
Limits authenticated users to the minimum privileges required for attachments, preventing the low-privilege exploitation path (CWE-266/284).
Requires prompt application of the vendor patch (v8.21 / commit c413a7e) that corrects the improper access-control logic in the Attachment Storage component.