CVE Explorer
CVE-2026-6739
Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 fail to require system-level permission when patching protected default system roles, which allows authenticated users with delegated user-management permissions to escalate privileges by altering built-in role permissions via the role patch API.. Mattermost Advisory ID: MMSA-2026-00656
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","product":"Mattermost","vendor":"Mattermost","versions":[{"lessThanOrEqual":"11.6.1","status":"affected","version":"11.6.0","versionType":"semver"},{"lessThanOrEqual":"11.5.4","status":"affected","version":"11.5.0","versionType":"semver"},{"lessThanOrEqual":"10.11.15","status":"affected","version":"10.11.0","versionType":"semver"},{"lessThanOrEqual":"10.11.16","status":"affected","version":"10.11.0","versionType":"semver"},{"status":"unaffected","version":"11.7.0"},{"status":"unaffected","version":"11.6.2"},{"status":"unaffected","version":"11.5.5"},{"status":"una…
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:3ece7b2f294c22491730f17de5a6395eca41c6a059216916baa5e8f5dbd0e798 · sha256:77a44e123959ebb5… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":6.7,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:3ece7b2f294c22491730f17de5a6395eca41c6a059216916baa5e8f5dbd0e798 · sha256:77a44e123959ebb5… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-863","description":"CWE-863: Incorrect Authorization","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:3ece7b2f294c22491730f17de5a6395eca41c6a059216916baa5e8f5dbd0e798 · sha256:77a44e123959ebb5… · /containers/cna/problemTypes/0/descriptions/0
Source references
1 source assertion{"name":"MMSA-2026-00656","tags":["vendor-advisory"],"url":"https://mattermost.com/security-updates"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:3ece7b2f294c22491730f17de5a6395eca41c6a059216916baa5e8f5dbd0e798 · sha256:77a44e123959ebb5… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.