HOMEVULNERABILITIESCVE-2026-9162
MEDIUM

CVE-2026-9162

CWE-613Published: June 22, 2026· Updated: Jun 23, 2026

4.3
CVSS v3.1
EPSS:0.20%probability of exploitation in 30 daysPercentile:10.0th

Official Description

Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to invalidate cached authentication state for active WebSocket connections during global session revocation, which allows a user with an existing WebSocket connection to remain authenticated and continue receiving real-time events until the cached session expires or the client reconnects.. Mattermost Advisory ID: MMSA-2026-00664

NVD Source

Technical Analysis

CVE-2026-9162 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected Vendors & Products

mattermost1 product
mattermost server
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

ADVISORYhttps://mattermost.com/security-updates

All References (1)

→
https://mattermost.com/security-updatesVendor Advisory

Quick Facts

CVE IDCVE-2026-9162
CVSS Score4.3 / 10
SeverityMEDIUM
WeaknessCWE-613
CISA KEVNo
EPSS (30d)0.20%
Affected1 vendor
PublishedJun 22, 2026

Related CVEs (CWE-613)

CVE-2026-26290
9.8
CVE-2026-1435
9.8
CVE-2025-59786
9.8
CVE-2026-26342
9.8
CVE-2026-27647
9.8
CVE-2026-8670
9.6

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-9162 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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