01 Record
CVE-2026-96259
Mattermost server-side request forgery via OAuth endpoints configurable by a System Administrator
MediumPUBLISHEDCNA: Mattermost
CNA base score5.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N
02 Description
Mattermost server-side request forgery via OAuth endpoints configurable by a System Administrator
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- Not scored by EPSS
- EPSS percentile
- Not scored by EPSS
- NVD base score
- The NVD has published no score for this record
- NVD CVSS vector
- No NVD score to derive
- NVD analysis status
- Not recorded
- Red Hat severity
- No Red Hat rating. Red Hat rates the CVEs that affect its products.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2026-09-22 20:34Z1 HR AGO
- Last updated
- 2026-09-22 20:34Z1 HR AGO
- Reserved
- 2026-09-22
- Assigning CNA
- Mattermost
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 5.5)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N
- Weaknesses
- CWE-918Server-Side Request Forgery (SSRF)Base
- Data version
- 5.2
- Document digest
- 96337c59d8998bec4ae5271ce6e416e6846874765667684f1d1cacd920c2d4e5
05 Affected products
VendorProductVersionsPlatforms
06 References
- mattermost.comMMSA-2026-00776https://mattermost.com/security-updates
07 Remediation
Update Mattermost to versions 11.11.0, 11.9.2, 11.8.6, 11.7.11, 11.10.2 or higher.