CVE-2026-4053 json
post edit time limit is not enforced on some post update operations
published 5mo ago modified 4mo ago also GHSA-hw87-6jcq-9f8q , GO-2026-5442 , EUVD-2026-30586
- cvss
- 3.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 5%
- public exploits
- 0
- none known
Summary
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to enforce the PostEditTimeLimit on non-message post fields which allows an authenticated user to modify post file attachments, props, and pin status after the edit window has expired via the post patch and update API endpoints.. Mattermost Advisory ID: MMSA-2026-00631
Patch / fix
- go github.com/mattermost/mattermost-server 0.0.0-20260414103857-b21ef302025e, 11.5.2, 11.5.2+incompatible
- Mattermost Mattermost 10.11.14, 11.5.2, 11.6.0
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
Is CVE-2026-4053 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5mo ago
Exploit prediction
0.17% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 3.1 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N |
| NVD | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
| GitHub | 3.1 | 3.1 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost-server | >=11.5.0, <11.5.2 >=0.0.0-20250731163400-5b955468ea1e, <0.0.0-20260414103857-b21ef302025e >=11.5.0+incompatible, <11.5.2+incompatible |
11.5.2 0.0.0-20260414103857-b21ef302025e 11.5.2+incompatible |
Affected products
- Mattermost Mattermost
Classification
- Weakness
-
- CWE-672 Operation on a Resource after Expiration or Release
References
-
mattermost.com
/security-updates
vendor-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-4053
advisory
-
github.com
/mattermost/mattermost
package
-
github.com
/advisories/GHSA-hw87-6jcq-9f8q
advisory
Sources
- CVE List CVE-2026-4053
- GitHub Advisory GHSA-hw87-6jcq-9f8q
- NVD CVE-2026-4053
- OSV GO-2026-5442
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