CVE•Published 2026-06-12•Modified 2026-06-18•1 article on news•6 live references•NVD data
CVE-2026-7387Mattermost · Mattermost_server
Vulnerability data via NVD (ingested)
CVSS v3.1
8.8
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS percentile
21
Exploit Prediction Scoring System · top 79% of all CVEs
Weaknesses (CWE)
Description
Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 Mattermost fails to require role-management authorization when setting the scheme_admin flag on group syncable link and patch endpoints, which allows a user with group-link permissions to escalate themselves and group members to team or channel admin via crafted API requests.. Mattermost Advisory ID: MMSA-2026-00665
Timeline
Published 2026-06-12
Modified 2026-06-18
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2026-7387Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Mattermost Mattermost Server"All exposed Mattermost Mattermost Server instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Mattermost Server"HTTP body or banner mentions "Mattermost Server" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-7387Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-7387Censys host search filtered to this CVE id.
grep.app
CVE-2026-7387Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-7387GitHub code search for direct mentions.
Google dork
"CVE-2026-7387" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.