CVE-2026-9597
An attacker can exploit multiple vulnerabilities in Mattermost Server to manipulate data, bypass security measures, or conduct other unspecified attacks.
CSIRTS triage
- What
- Multiple vulnerabilities can be exploited to manipulate data and bypass security measures.
- Who is affected
- Users of Mattermost Server are affected.
- Urgency
- Remediation is medium urgency as the specific impacts are unspecified.
- Action
- Update Mattermost Server to the latest version to mitigate these vulnerabilities.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 4% of all EPSS-scored CVEs.
Advisory coverage (2)
- medium[UPDATE] [medium] Mattermost Server: Multiple vulnerabilitiescert-bund · 2026-07-28
- mediumCVE-2026-9597: Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4 fail to verify whether a guest account i…nvd · 2026-07-13
External references
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[](https://www.csirts.com/cve/CVE-2026-9597)