{"cve":"CVE-2024-29977","nvd":{"published":"2024-08-01T15:15:11.290","modified":"2026-06-17T07:23:28.780","status":"Analyzed","description":"Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6 fail to properly validate synced reactions, when shared channels are enabled, which allows a malicious remote to create arbitrary reactions on arbitrary posts","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","score":4.3},"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-2024-29977","score":0.00276,"percentile":0.20015,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-jq3g-xqpx-37x3","url":"https://osv.dev/vulnerability/GHSA-jq3g-xqpx-37x3","summary":"Mattermost failed to properly validate synced reactions","modified":"2024-11-18T16:26:57Z","packages":[{"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":[">=9.9.0 <9.9.1"],"fixed":["9.9.1"]}]},{"id":"GO-2024-3030","url":"https://osv.dev/vulnerability/GO-2024-3030","summary":"Mattermost failed to properly validate synced reactions in github.com/mattermost/mattermost-server","modified":"2026-03-03T04:55:36.840171Z","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",">=9.9.0+incompatible <9.9.1+incompatible"],"fixed":["9.5.7+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."]}