CVE-2026-10103
- Source
- https://cve.org/CVERecord?id=CVE-2026-10103
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-10103.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-10103
- Downstream
- Published
- 2026-07-13T07:57:11.062Z
- Modified
- 2026-07-16T03:48:14.768048682Z
- Severity
-
- 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N CVSS Calculator
- Summary
- Authenticated remote cluster can modify or delete posts it does not own in Mattermost Connected Workspaces shared channels
- Details
-
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to verify post ownership in the shared channel inbound sync handler, which allows an authenticated remote cluster to modify or delete posts authored by local users or other remotes via crafted sync messages referencing arbitrary post IDs in channels shared with that remote.. Mattermost Advisory ID: MMSA-2026-00689
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/10xxx/CVE-2026-10103.json", "cwe_ids": [ "CWE-639" ], "unresolved_ranges": [ { "extracted_events": [ { "introduced": "11.7.0" }, { "last_affected": "11.7.2" }, { "introduced": "11.6.0" }, { "last_affected": "11.6.4" }, { "introduced": "10.11.0" }, { "last_affected": "10.11.19" } ], "source": "AFFECTED_FIELD" } ], "cna_assigner": "Mattermost" }- References
Affected packages
Git / github.com/mattermost/mattermost
Affected ranges
- Type
- GIT
- Repo
- https://github.com/mattermost/mattermost
- Events
- Database specific
{ "extracted_events": [ { "introduced": "10.11.0" }, { "fixed": "10.11.20" }, { "introduced": "11.6.0" }, { "fixed": "11.6.5" }, { "introduced": "11.7.0" }, { "fixed": "11.7.3" } ], "source": "CPE_RANGE", "cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*" }
Affected versions
@mattermost/client@10.*
@mattermost/client@10.11.0
@mattermost/client@11.*
@mattermost/client@11.7.0
@mattermost/shared@11.*
@mattermost/shared@11.7.0
@mattermost/types@10.*
@mattermost/types@10.11.0
@mattermost/types@11.*
@mattermost/types@11.7.0
mattermost-redux@10.*
mattermost-redux@10.11.0
mattermost-redux@11.*
mattermost-redux@11.7.0
v10.*
v10.11.0
v10.11.0-rc3
v10.11.1
v10.11.1-rc1
v10.11.10
v10.11.11
v10.11.11-rc1
v10.11.11-rc2
v10.11.12
v10.11.13
v10.11.13-rc1
v10.11.14
v10.11.14-rc1
v10.11.15
v10.11.15-rc1
v10.11.16
v10.11.17
v10.11.18
v10.11.19
v10.11.19-rc1
v10.11.2
v10.11.2-rc1
v10.11.2-rc2
v10.11.3
v10.11.4
v10.11.4-rc1
v10.11.4-rc2
v10.11.4-rc3
v10.11.5
v10.11.6
v10.11.7
v10.11.8
v10.11.9
v10.11.9-rc1
v11.*
v11.6.0
v11.6.1
v11.6.1-rc1
v11.6.2
v11.6.3
v11.6.4
v11.7.0
v11.7.1
v11.7.2