CVE-2026-4635
- Source
- https://cve.org/CVERecord?id=CVE-2026-4635
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-4635.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-4635
- Aliases
- Downstream
- Related
- Published
- 2026-05-22T10:28:47.634Z
- Modified
- 2026-07-31T18:30:24.375582619Z
- Severity
-
- 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- Persistent notification timing attack causing server denial of service
- Details
-
Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to archive the channel before removing persistent notifications which allows authenticated user to crash the server via timing the creation of persistent notification message between the server deleting existing persistent notifications and archiving the channel.. Mattermost Advisory ID: MMSA-2026-00637
- Database specific
{ "unresolved_ranges": [ { "source": "AFFECTED_FIELD", "extracted_events": [ { "introduced": "11.6.0" }, { "last_affected": "11.6.0" }, { "introduced": "11.5.0" }, { "last_affected": "11.5.3" }, { "introduced": "11.4.0" }, { "last_affected": "11.4.4" }, { "introduced": "10.11.0" }, { "last_affected": "10.11.14" } ] } ], "cna_assigner": "Mattermost", "cwe_ids": [ "CWE-362" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4635.json" }- References
Affected packages
Git / github.com/mattermost/mattermost
Affected ranges
- Type
- GIT
- Repo
- https://github.com/mattermost/mattermost
- Events
-
IntroducedFixedIntroducedFixedIntroducedFixedIntroducedFixed
- Database specific
{ "source": "CPE_RANGE", "cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "extracted_events": [ { "introduced": "10.11.0" }, { "fixed": "10.11.15" }, { "introduced": "11.4.0" }, { "fixed": "11.4.5" }, { "introduced": "11.5.0" }, { "fixed": "11.5.4" }, { "introduced": "11.6.0" }, { "fixed": "11.6.1" } ] }
Affected versions
@mattermost/client@10.*
@mattermost/client@10.11.0
@mattermost/client@11.*
@mattermost/client@11.4.0
@mattermost/types@10.*
@mattermost/types@10.11.0
@mattermost/types@11.*
@mattermost/types@11.4.0
mattermost-redux@10.*
mattermost-redux@10.11.0
mattermost-redux@11.*
mattermost-redux@11.4.0
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
v10.11.2
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.*
v11.4.0
v11.4.0-rc3
v11.4.1
v11.4.1-rc1
v11.4.1-rc2
v11.4.2
v11.4.3
v11.4.4
v11.5.0
v11.5.1
v11.5.2
v11.5.2-rc1
v11.5.2-rc2
v11.5.2-rc3
v11.5.3
v11.6.0