CVE Explorer

CVE-2026-27659

Mattermost versions 11.2.x <= 11.2.2, 10.11.x <= 10.11.10, 11.4.x <= 11.4.0, 11.3.x <= 11.3.1 fail to properly validate CSRF tokens in the /api/v4/access_control_policies/{policy_id}/activate endpoint, which allows an attacker to trick an admin into changing access control policy active status via a crafted request.. Mattermost Advisory ID: MMSA-2026-00578

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:d48a2fdf98cc6199d66ab9d465ee4a06cd63bd5502df82c6f0e619ab08f1328d

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"defaultStatus":"unaffected","product":"Mattermost","vendor":"Mattermost","versions":[{"lessThanOrEqual":"11.2.2","status":"affected","version":"11.2.0","versionType":"semver"},{"lessThanOrEqual":"10.11.10","status":"affected","version":"10.11.0","versionType":"semver"},{"lessThanOrEqual":"11.4.0","status":"affected","version":"11.4.0","versionType":"semver"},{"lessThanOrEqual":"11.3.1","status":"affected","version":"11.3.0","versionType":"semver"},{"status":"unaffected","version":"11.5.0"},{"status":"unaffected","version":"11.2.3"},{"status":"unaffected","version":"10.11.11"},{"status":"unaf…

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:035b25009e0d835770cfbbafef4dcacbaa7bc2f173c3d3e14bc2847a3e030889 · sha256:26b47b0db2643ee3… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.6,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:035b25009e0d835770cfbbafef4dcacbaa7bc2f173c3d3e14bc2847a3e030889 · sha256:26b47b0db2643ee3… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-352","description":"CWE-352: Cross-Site Request Forgery (CSRF)","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:035b25009e0d835770cfbbafef4dcacbaa7bc2f173c3d3e14bc2847a3e030889 · sha256:26b47b0db2643ee3… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion

{"name":"MMSA-2026-00578","tags":["vendor-advisory"],"url":"https://mattermost.com/security-updates"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:035b25009e0d835770cfbbafef4dcacbaa7bc2f173c3d3e14bc2847a3e030889 · sha256:26b47b0db2643ee3… · /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.

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