Private team metadata disclosure via the team search API
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 properly restrict private teams from public team search results, which allows an authenticated user without permission to list private teams to disclose the ID, name, and display name of private teams via a modified team search request. Mattermost Advisory ID: MMSA-2026-00748
CVE-2026-18256
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-18256
Mattermost
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "Mattermost",
"product": "Mattermost",
"versions": [
{
"status": "affected",
"version": "11.10.0",
"versionType": "semver",
"lessThanOrEqual": "11.10.0"
},
{
"status": "affected",
"version": "11.7.0",
"versionType": "semver",
"lessThanOrEqual": "11.7.9"
},
{
"status": "affected",
"version": "11.9.0",
"versionType": "semver",
"lessThanOrEqual": "11.9.1"
},
{
"status": "affected",
"version": "11.8.0",
"versionType": "semver",
"lessThanOrEqual": "11.8.5"
},
{
"status": "unaffected",
"version": "11.11.0"
},
{
"status": "unaffected",
"version": "11.10.1"
},
{
"status": "unaffected",
"version": "11.7.10"
},
{
"status": "unaffected",
"version": "11.9.2"
},
{
"status": "unaffected",
"version": "11.8.6"
}
],
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-18256
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #32399 · Revision 1
- Added to Heist Feed
- Publisher date