CVE-2026-52891

criticalCVSS 9.9covered by 1 sourcefirst seen 2026-07-15

Wekan is open source kanban built with Meteor. Prior to 9.07, Wekan avatar upload functionality embeds user-supplied filenames into paths later passed to child_process.exec() for MIME-type detection. Because models/avatars.js and models/fileValidation.js used a shell command with the avatar filename, shell metacharacters such as backticks and $() in the filename could execute commands on the server. This issue is fixed in version 9.07.

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Exploitation outlook

Low exploitation risk0.40% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all EPSS-scored CVEs.

Advisory coverage (1)

criticalCVE-2026-52891: Wekan is open source kanban built with Meteor. Prior to 9.07, Wekan avatar upload functionalit…nvd · 2026-07-15

External references

NVD record for CVE-2026-52891

CVE.org record

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