CVE-2026-95666
- Source
- https://cve.org/CVERecord?id=CVE-2026-95666
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-95666.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-95666
- Published
- 2026-09-22T13:11:13Z
- Modified
- 2026-10-09T02:49:30Z
- Severity
-
- 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
- Summary
- Unbounded post ID array in the bulk reactions endpoint allows denial of service
- Details
-
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 limit the length of the post ID array accepted by the bulk reactions endpoint which allows an authenticated user to cause excessive database load via a crafted request to {{POST /api/v4/posts/ids/reactions}}.. Mattermost Advisory ID: MMSA-2026-00771
- Database specific
{ "cna_assigner": "Mattermost", "cwe_ids": [ "CWE-770" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/95xxx/CVE-2026-95666.json", "unresolved_ranges": [ { "extracted_events": [ { "introduced": "11.9.0" }, { "last_affected": "11.9.1" }, { "introduced": "11.8.0" }, { "last_affected": "11.8.5" }, { "introduced": "11.7.0" }, { "last_affected": "11.7.10" }, { "introduced": "11.10.0" }, { "last_affected": "11.10.1" } ], "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": "11.7.11" }, { "introduced": "11.9.0" }, { "fixed": "11.9.2" }, { "introduced": "11.10.0" }, { "fixed": "11.10.2" } ], "source": "CPE_RANGE" }
Affected versions
@mattermost/client@11.*
@mattermost/client@11.7.0
@mattermost/client@11.9.0
@mattermost/shared@11.*
@mattermost/shared@11.7.0
@mattermost/shared@11.9.0
@mattermost/types@11.*
@mattermost/types@11.7.0
@mattermost/types@11.9.0
mattermost-redux@11.*
mattermost-redux@11.7.0
mattermost-redux@11.9.0
v11.*
v11.10.0
v11.10.0-rc3
v11.10.1
v11.7.0
v11.7.1
v11.7.10
v11.7.2
v11.7.3
v11.7.4
v11.7.5
v11.7.5-rc1
v11.7.6
v11.7.7
v11.7.8
v11.7.9
v11.9.0
v11.9.1
v11.9.1-rc1