CVE Explorer

CVE-2026-6673

Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to authenticate Atlassian Connect installed callbacks, allowing a remote unauthenticated attacker to inject a rogue sharedSecret and disrupt the Jira integration via POST to /ac/installed during the pending-install window.. Mattermost Advisory ID: MMSA-2026-00654

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:7d4c83be11d88152c3f3068723373de99fe1f511227732cc8d5cab3fc83ce9d7

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"defaultStatus":"unaffected","product":"Mattermost","vendor":"Mattermost","versions":[{"lessThanOrEqual":"11.7.0","status":"affected","version":"11.7.0","versionType":"semver"},{"lessThanOrEqual":"11.6.2","status":"affected","version":"11.6.0","versionType":"semver"},{"lessThanOrEqual":"11.5.5","status":"affected","version":"11.5.0","versionType":"semver"},{"lessThanOrEqual":"10.11.17","status":"affected","version":"10.11.0","versionType":"semver"},{"status":"unaffected","version":"11.8.0"},{"status":"unaffected","version":"11.7.1"},{"status":"unaffected","version":"11.6.3"},{"status":"unaffe…

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:f8594d5aa272741f94854c2a65cfaecf4e2c1394df7d577dea3cc5746eac03f7 · sha256:d6790d2479012af3… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.4,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:f8594d5aa272741f94854c2a65cfaecf4e2c1394df7d577dea3cc5746eac03f7 · sha256:d6790d2479012af3… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-306","description":"CWE-306: Missing Authentication for Critical Function","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:f8594d5aa272741f94854c2a65cfaecf4e2c1394df7d577dea3cc5746eac03f7 · sha256:d6790d2479012af3… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion

{"name":"MMSA-2026-00654","tags":["vendor-advisory"],"url":"https://mattermost.com/security-updates"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:f8594d5aa272741f94854c2a65cfaecf4e2c1394df7d577dea3cc5746eac03f7 · sha256:d6790d2479012af3… · /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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