CVE-2026-15754
- Source
- https://cve.org/CVERecord?id=CVE-2026-15754
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-15754.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-15754
- Published
- 2026-08-17T14:36:56Z
- Modified
- 2026-08-20T03:54:12Z
- Severity
-
- 4.2 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:H/A:N CVSS Calculator
- Summary
- Missing per-channel team-scope check in ABAC access control policy unassign allows cross-team policy removal
- Details
-
Mattermost versions 11.7.x <= 11.7.6, 11.8.x <= 11.8.3 The access control policy unassign endpoint fails to re-validate that each target channel still belongs to the requesting admin's team, which allows an authenticated team administrator to remove ABAC (attribute-based access control) policy assignments from channels outside their team via the policy unassign API after a channel has been moved to another team.. Mattermost Advisory ID: MMSA-2026-00718
- Database specific
{ "cna_assigner": "Mattermost", "cwe_ids": [ "CWE-863" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/15xxx/CVE-2026-15754.json", "unresolved_ranges": [ { "extracted_events": [ { "introduced": "11.7.0" }, { "last_affected": "11.7.6" }, { "introduced": "11.8.0" }, { "last_affected": "11.8.3" } ], "source": "AFFECTED_FIELD" } ] }- References
Affected packages
Git / github.com/mattermost/mattermost
Affected ranges
- Type
- GIT
- Repo
- https://github.com/mattermost/mattermost
- Events
- Database specific
-
Show details
{ "cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "extracted_events": [ { "introduced": "11.7.0" }, { "fixed": "11.7.7" }, { "introduced": "11.8.0" }, { "fixed": "11.8.4" } ], "source": "CPE_RANGE" }
Affected versions
@mattermost/client@11.*
@mattermost/client@11.7.0
@mattermost/client@11.8.0
@mattermost/shared@11.*
@mattermost/shared@11.7.0
@mattermost/shared@11.8.0
@mattermost/types@11.*
@mattermost/types@11.7.0
@mattermost/types@11.8.0
mattermost-redux@11.*
mattermost-redux@11.7.0
mattermost-redux@11.8.0
v11.*
v11.7.0
v11.7.1
v11.7.2
v11.7.3
v11.7.4
v11.7.5
v11.7.5-rc1
v11.7.6
v11.8.0
v11.8.0-rc5
v11.8.1
v11.8.2
v11.8.3