CVE•Published 2026-10-16•Modified 2026-10-16•0 articles on news•4 live references•NVD data
CVE-2026-16453
Vulnerability data via NVD (ingested)
CVSS v3.1
7.1
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
EPSS percentile
—
Weaknesses (CWE)
Description
Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail to verify the integrity of the SAML RelayState POST parameter which allows an authenticated SAML user to join any team, including invite-only teams, via forging the team_id or invite_id fields in the RelayState.. Mattermost Advisory ID: MMSA-2026-00727
Timeline
Published 2026-10-16
Modified 2026-10-16
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).
More intel sources (5)
Shodan report
vuln:CVE-2026-16453Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-16453Censys host search filtered to this CVE id.
grep.app
CVE-2026-16453Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-16453GitHub code search for direct mentions.
Google dork
"CVE-2026-16453" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-16453 on GitHub.
We haven't classified any articles referencing CVE-2026-16453 yet. The external references above still apply.