Data Retention Teams Endpoint Leaks Private Team Invite ID
Summary
| CVE | CVE-2026-91181 |
|---|---|
| State | PUBLISHED |
| Assigner | Mattermost |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-14 22:16:59 UTC |
| Updated | 2026-09-14 22:16:59 UTC |
| Description | Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 Fail to sanitize Team objects returned by the data retention teams endpoint which allows an authenticated user holding only the read-only Data Retention Policy permission to obtain a private team's secret invite_id and email, and use it to join the team without authorization, via GET /api/v4/data_retention/policies/{policy_id}/teams.. Mattermost Advisory ID: MMSA-2026-00702 |
Risk And Classification
Primary CVSS: v3.1 6.5 MEDIUM from [email protected]
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
Problem Types: CWE-863 | CWE-863 CWE-863: Incorrect Authorization
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 6.5 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N |
| 3.1 | CNA | CVSS | 6.5 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
HighUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
NoneCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Mattermost | Mattermost | affected 11.9.0 11.9.0 semver | Not specified |
| CNA | Mattermost | Mattermost | affected 11.8.0 11.8.4 semver | Not specified |
| CNA | Mattermost | Mattermost | affected 11.7.0 11.7.7 semver | Not specified |
| CNA | Mattermost | Mattermost | affected 10.11.0 10.11.22 semver | Not specified |
| CNA | Mattermost | Mattermost | unaffected 11.10.0 | Not specified |
| CNA | Mattermost | Mattermost | unaffected 11.9.1 | Not specified |
| CNA | Mattermost | Mattermost | unaffected 11.8.5 | Not specified |
| CNA | Mattermost | Mattermost | unaffected 11.7.8 | Not specified |
| CNA | Mattermost | Mattermost | unaffected 10.11.23 | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| mattermost.com/security-updates | [email protected] | mattermost.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: 0x7oda7123 (en)
Additional Advisory Data
Solutions
CNA: Update Mattermost to versions 11.10.0, 11.9.1, 11.8.5, 11.7.8, 10.11.23 or higher.
There are currently no legacy QID mappings associated with this CVE.