References https://nvd.nist.gov/vuln/detail/CVE-2025-12421 https://zeropath.com/blog/mattermost-cve-2025-12421-account-takeover https://www.sentinelone.com/vulnerability-database/cve-2025-12421/ https://access.redhat.com/security/cve/cve-2025-12421 https://github.com/advisories/GHSA-mp6x-97xj-9x62 https://mattermost.com/security-updates/ https://www.ncsc.gov.ie/pdfs/2511280181_CVE-2025-12421.pdf https://ccb.belgium.be/advisories/warning-critical-account-takeover-mattermost-patch-immediately https://vulners.com/cve/CVE-2025-12421 https://www.cyberhub.blog/cves/CVE-2025-12421
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