CVE Explorer
CVE-2026-6517
Mattermost Desktop App versions <=6.1 5.5.13.0 fail to restrict the allow list of domains to which NTLM credentials were forwarded to in the Mattermost Desktop App which allows any user on a server without the image proxy enabled to intercept other users credentials via embedding an image that routes to an external web server. Mattermost Advisory ID: MMSA-2026-00651
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":"5.5.13","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"6.2.0"},{"status":"unaffected","version":"5.13.6.0"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:703af1b9c07923f2ed6aa0f6f5e697b195ec25622e9d90861b6913c9d4eec3e4 · sha256:d592e08d9dc3af90… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.3,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:703af1b9c07923f2ed6aa0f6f5e697b195ec25622e9d90861b6913c9d4eec3e4 · sha256:d592e08d9dc3af90… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-522","description":"CWE-522: Insufficiently Protected Credentials","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:703af1b9c07923f2ed6aa0f6f5e697b195ec25622e9d90861b6913c9d4eec3e4 · sha256:d592e08d9dc3af90… · /containers/cna/problemTypes/0/descriptions/0
Source references
1 source assertion{"name":"MMSA-2026-00651","tags":["vendor-advisory"],"url":"https://mattermost.com/security-updates"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:703af1b9c07923f2ed6aa0f6f5e697b195ec25622e9d90861b6913c9d4eec3e4 · sha256:d592e08d9dc3af90… · /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.