CVE Explorer

CVE-2026-9571

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to invalidate OAuth refresh tokens upon user account deactivation, which allows a deactivated user or an attacker in possession of a valid refresh token to obtain new functional access tokens via the OAuth refresh token grant endpoint.. Mattermost Advisory ID: MMSA-2026-00680

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:baa20b917412241bbf390c34bd22cb063cca9c50f7574546fba301e339b97ca9

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"defaultStatus":"unaffected","product":"Mattermost","vendor":"Mattermost","versions":[{"lessThanOrEqual":"11.7.2","status":"affected","version":"11.7.0","versionType":"semver"},{"lessThanOrEqual":"11.6.4","status":"affected","version":"11.6.0","versionType":"semver"},{"lessThanOrEqual":"10.11.19","status":"affected","version":"10.11.0","versionType":"semver"},{"status":"unaffected","version":"11.8.0"},{"status":"unaffected","version":"11.7.3"},{"status":"unaffected","version":"11.6.5"},{"status":"unaffected","version":"10.11.20"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:ce42a4d5c445db424889a8968f7518a9f80ab3b04034f412e3ccd3c0699a3a7a · sha256:34df1e7e8fd23617… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:ce42a4d5c445db424889a8968f7518a9f80ab3b04034f412e3ccd3c0699a3a7a · sha256:34df1e7e8fd23617… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-305","description":"CWE-305 – Authentication Bypass by Primary Weakness","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:ce42a4d5c445db424889a8968f7518a9f80ab3b04034f412e3ccd3c0699a3a7a · sha256:34df1e7e8fd23617… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion

{"name":"MMSA-2026-00680","tags":["vendor-advisory"],"url":"https://mattermost.com/security-updates"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:ce42a4d5c445db424889a8968f7518a9f80ab3b04034f412e3ccd3c0699a3a7a · sha256:34df1e7e8fd23617… · /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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