CVE Explorer
CVE-2026-6046
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 validate that a username returned during bot registration belongs to a bot account, which allows an unprivileged attacker to intercept private messages sent by plugins via direct message channels by pre-registering a user account with a predictable plugin bot username.. Mattermost Advisory ID: MMSA-2026-00649
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:cd0c50c05e0c17b962373471f8efe3e2ac6f8607033ecfcfa22be3b63f3c04b1 · sha256:ecc67eb0c4d44960… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:cd0c50c05e0c17b962373471f8efe3e2ac6f8607033ecfcfa22be3b63f3c04b1 · sha256:ecc67eb0c4d44960… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-200","description":"CWE-200 Exposure of Sensitive Information to an Unauthorized Actor","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:cd0c50c05e0c17b962373471f8efe3e2ac6f8607033ecfcfa22be3b63f3c04b1 · sha256:ecc67eb0c4d44960… · /containers/cna/problemTypes/0/descriptions/0
Source references
1 source assertion{"name":"MMSA-2026-00649","tags":["vendor-advisory"],"url":"https://mattermost.com/security-updates"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:cd0c50c05e0c17b962373471f8efe3e2ac6f8607033ecfcfa22be3b63f3c04b1 · sha256:ecc67eb0c4d44960… · /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.