{"id":"CVE-2026-52891","title":"Wekan is open source kanban built with Meteor","summary":"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/…","severity":"critical","cvss":9.9,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","cwe":["CWE-78","CWE-88"],"published":"2026-07-15","updated":"2026-07-17","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-52891","references":[{"url":"https://github.com/wekan/wekan/commit/a4c74a5980e9f778eb444fd346f32aa3d16786a9","label":"security-advisories@github.com"},{"url":"https://github.com/wekan/wekan/releases/tag/v9.07","label":"security-advisories@github.com"},{"url":"https://github.com/wekan/wekan/security/advisories/GHSA-35j7-h385-2q9g","label":"security-advisories@github.com"}],"tags":["nvd"],"epss":0.00785,"epssPercentile":0.54136,"ingestedAt":"2026-07-18T18:24:14.331Z","slug":"CVE-2026-52891","body":"## Overview\n\nWekan 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":55,"depthScoreParts":{"impact":54.5,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}