CVE-2026-12985
- Source
- https://cve.org/CVERecord?id=CVE-2026-12985
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-12985.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-12985
- Published
- 2026-09-14T14:09:53Z
- Modified
- 2026-10-09T02:49:21Z
- Severity
-
- 6.8 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N CVSS Calculator
- Summary
- Mattermost DCR redirect URI allowlist bypass via improper URL component validation
- Details
-
Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7 Mattermost failed to validate Dynamic Client Registration redirect URIs by URL component (matching glob patterns against the raw URI string instead) which allows a remote unauthenticated attacker to register an OAuth client with an attacker-controlled callback host that bypasses the configured redirect URI allowlist via a crafted redirect URI that places an allowlisted host/path suffix inside the query string.. Mattermost Advisory ID: MMSA-2026-00700
- Database specific
{ "cna_assigner": "Mattermost", "cwe_ids": [ "CWE-601" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/12xxx/CVE-2026-12985.json", "unresolved_ranges": [ { "extracted_events": [ { "introduced": "11.8.0" }, { "last_affected": "11.8.4" }, { "introduced": "11.7.0" }, { "last_affected": "11.7.7" }, { "introduced": "11.9.0" }, { "last_affected": "11.9.0" } ], "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": "11.7.8" }, { "introduced": "11.8.0" }, { "fixed": "11.8.5" }, { "introduced": "11.9.0" }, { "fixed": "11.9.1" } ], "source": "CPE_RANGE" }
Affected versions
@mattermost/client@11.*
@mattermost/client@11.7.0
@mattermost/client@11.8.0
@mattermost/client@11.9.0
@mattermost/shared@11.*
@mattermost/shared@11.7.0
@mattermost/shared@11.8.0
@mattermost/shared@11.9.0
@mattermost/types@11.*
@mattermost/types@11.7.0
@mattermost/types@11.8.0
@mattermost/types@11.9.0
mattermost-redux@11.*
mattermost-redux@11.7.0
mattermost-redux@11.8.0
mattermost-redux@11.9.0
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
v11.7.7
v11.8.0
v11.8.0-rc5
v11.8.1
v11.8.2
v11.8.3
v11.8.4
v11.9.0