CVE-2026-26304 json
Permission Bypass in Playbook Run Creation
published 2026-03-16 7 mo ago modified 2026-06-17 4 mo ago also GHSA-4pmx-622h-x359 , GO-2026-4812 , EUVD-2026-12512
- cvss
- 4.3
- 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 6%
- public exploits
- 0
- none known
Summary
Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2 fail to verify run_create permission for empty playbookId, which allows team members to create unauthorized runs via the playbook run API. Mattermost Advisory ID: MMSA-2025-00542
Patch / fix
- go github.com/mattermost/mattermost-plugin-playbooks 1.41.1-0.20260316224925-705f54a81841
- Mattermost Mattermost 11.2.3, 11.3.1, 11.4.0
- govulncheck-vulndb openSUSE Leap 15.6 0.0.20260326T203309-150000.1.155.2
suse advisories SUSE-SU-2026:1135-1
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.17% chance of exploitation in the next 30 days, higher than 6% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 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 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost-plugin-playbooks | <1.41.1-0.20260316224925-705f54a81841 |
1.41.1-0.20260316224925-705f54a81841 |
Affected products
- Mattermost Mattermost
Classification
- Weakness
-
- CWE-863 Incorrect Authorization
References
-
github.com
/mattermost/mattermost-plugin-playbooks/commit/705f54a818410f3612df3865bfde608ed471037e
web, patch
-
mattermost.com
/security-updates
vendor-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-26304
advisory
-
github.com
/mattermost/mattermost-plugin-playbooks
package
-
github.com
/advisories/GHSA-4pmx-622h-x359
advisory
Sources
- CVE List CVE-2026-26304
- GitHub Advisory GHSA-4pmx-622h-x359
- NVD CVE-2026-26304
- OSV GO-2026-4812
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