{"cve":"CVE-2024-39777","nvd":{"published":"2024-08-01T15:15:12.370","modified":"2026-06-17T07:42:46.440","status":"Analyzed","description":"Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5 and 9.8.x <= 9.8.1 fail to disallow unsolicited invites to expose access to local channels, when shared channels are enabled, which allows a malicious remote to send an invite with the ID of an existing local channel, and that local channel will then become shared without the consent of the local admin.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","score":9.6},"cwes":["CWE-284"],"references":["https://mattermost.com/security-updates"],"products":["mattermost:mattermost"],"source":"nvd","synced_at":"2026-10-19T21:53:51.317825789+00:00"},"epss":{"cve":"CVE-2024-39777","score":0.00363,"percentile":0.30138,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-q22q-2rrf-m27p","url":"https://osv.dev/vulnerability/GHSA-q22q-2rrf-m27p","summary":"Mattermost allows unsolicited invites to expose access to local channels","modified":"2024-11-18T16:26:58Z","packages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","ranges":[">=9.9.0 <9.9.1"],"fixed":["9.9.1"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","ranges":[">=9.5.0 <9.5.7"],"fixed":["9.5.7"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","ranges":[">=9.7.0 <9.7.6"],"fixed":["9.7.6"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","ranges":[">=9.8.0 <9.8.1"],"fixed":["9.8.1"]}]},{"id":"GO-2024-3092","url":"https://osv.dev/vulnerability/GO-2024-3092","summary":"Mattermost allows unsolicited invites to expose access to local channels in github.com/mattermost/mattermost-server","modified":"2026-03-03T04:55:44.129108Z","packages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","ranges":[">=9.5.0+incompatible <9.5.7+incompatible",">=9.7.0+incompatible <9.7.6+incompatible",">=9.8.0+incompatible <9.8.1+incompatible",">=9.9.0+incompatible <9.9.1+incompatible"],"fixed":["9.5.7+incompatible","9.7.6+incompatible","9.8.1+incompatible","9.9.1+incompatible"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server/v5","purl":"pkg:golang/github.com/mattermost/mattermost-server/v5","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server/v6","purl":"pkg:golang/github.com/mattermost/mattermost-server/v6","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","ranges":["all versions"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}