CVE-2026-19603
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
Private channel ID disclosure via user status endpoints
Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to sanitize the active channel field returned by the user status API endpoints, which allows an authenticated user to learn the channel ID of a private channel another user is actively viewing via the status endpoints, without being a member of that channel. Mattermost Advisory ID: MMSA-2026-00765
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Mattermost
- Vendor
- Mattermost
- Product
- Mattermost
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 11.9.0 | affected | semver | Unavailable | 11.9.1 | None listed |
| 11.8.0 | affected | semver | Unavailable | 11.8.5 | None listed |
| 11.7.0 | affected | semver | Unavailable | 11.7.10 | None listed |
| 11.10.0 | affected | semver | Unavailable | 11.10.1 | None listed |
| 11.11.0 | unaffected | Unavailable | Unavailable | Unavailable | None listed |
| 11.9.2 | unaffected | Unavailable | Unavailable | Unavailable | None listed |
| 11.8.6 | unaffected | Unavailable | Unavailable | Unavailable | None listed |
| 11.7.11 | unaffected | Unavailable | Unavailable | Unavailable | None listed |
| 11.10.2 | unaffected | Unavailable | Unavailable | Unavailable | None listed |