CVE-2026-93851
No exploitation reported by the sources we read.
- Published2026-10-28
- WeaknessCWE-22
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 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
Timeline
dates in UTC- 2026-10-2822:17CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-29 09:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-93851?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-93851?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-93851 yet.
Fix
No fix published by the sources we read yet. NVD record
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
- Published
- 2026-10-28
- Last Modified
- 2026-10-28
- NVD status
- Received
Frequently asked questions
What is CVE-2026-93851?
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What is the CVSS score for CVE-2026-93851?
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Same product first, then the same vendor advisory and the same publication week.