CVE-2026-9708
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)
Incoming webhook user attribution via unvalidated webhook owner
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to validate that an assigned incoming webhook user has access to the target team or channel, which allows a requester with webhook management permissions to create posts or direct messages attributed to another user via crafted incoming webhook configuration and payloads.. Mattermost Advisory ID: MMSA-2026-00683
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) |
|---|---|---|---|---|---|
| 11.7.0 | affected | semver | Unavailable | 11.7.2 | None listed |
| 11.6.0 | affected | semver | Unavailable | 11.6.4 | None listed |
| 10.11.0 | affected | semver | Unavailable | 10.11.19 | None listed |
| 11.8.0 | unaffected | Unavailable | Unavailable | Unavailable | None listed |
| 11.7.3 | unaffected | Unavailable | Unavailable | Unavailable | None listed |
| 11.6.5 | unaffected | Unavailable | Unavailable | Unavailable | None listed |
| 10.11.20 | unaffected | Unavailable | Unavailable | Unavailable | None listed |