{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-93851 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-93851 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-93851 is a high-severity vulnerability in Mattermost, published on 28 Oct 2026."},"fix_prompt":"Check this codebase for CVE-2026-93851 and fix it if it is affected.\n\nWhat it is: CVE-2026-93851 is a high-severity vulnerability in Mattermost, published on 28 Oct 2026. \nExploitation: There is no known exploitation of CVE-2026-93851 in the wild and no public exploit code.\n\nAffected product: Mattermost. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-93851/ (Markdown: https://insights.sbomify.com/CVE-2026-93851/index.md)","id":"CVE-2026-93851","markdown":"https://insights.sbomify.com/CVE-2026-93851/index.md","name":"CVE-2026-93851","record":{"aliases":["GHSA-jq9q-vph7-fh8w"],"analysis":null,"analysis_generated_by":null,"assigner":"Mattermost","cpe":[],"cvss":{"score":8,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-22","name":"Improper Limitation of a Pathname to a Restricted Directory"}],"description":"Mattermost versions 11.9.x \u003c= 11.9.1, 11.8.x \u003c= 11.8.5, 11.7.x \u003c= 11.7.10 fail to validate the target post ID in the Agents plugin's mention reminder component, which allows an authenticated user who can post in a channel visible to a system administrator to cause the administrator's browser to send an unintended API request, resulting in replacement of an installed plugin and code execution on the server, via a crafted post containing a forged mention reminder that the administrator clicks. Mattermost Advisory ID: MMSA-2026-00742","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Path traversal in Mattermost Agents plugin mention reminder allows plugin replacement via crafted post","id":"CVE-2026-93851","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":null,"year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Missing authorization in Blazar","id":"CVE-2026-93852"},"packages":[],"prev":{"headline":"Unbounded memory consumption during PDF text extraction","id":"CVE-2026-93850"},"products":["Mattermost"],"published":"2026-10-28","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-10-29","vendors":["Mattermost"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-93851/"}