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THREAT OPS › Threat News › [NVD] CVE-2026-22880 (MEDIUM 6.1) — Mattermost Mobile Apps versions <=2.37 11.4 2.0.37 11.0.4 11.1.3 11.3.2 10.11.11.0 fail to properly validate the SSO authentication callback origin which allows an attacker controlling a malicious Mattermost server to steal user credentials for a legitimate Mattermost server via

[NVD] CVE-2026-22880 (MEDIUM 6.1) — Mattermost Mobile Apps versions <=2.37 11.4 2.0.37 11.0.4 11.1.3 11.3.2 10.11.11.0 fail to properly validate the SSO authentication callback origin which allows an attacker controlling a malicious Mattermost server to steal user credentials for a legitimate Mattermost server via

lownvdPublished 2026-05-21

CVE-2026-22880 CVSS: 6.1 MEDIUM Published: 2026-05-21T09:16:26.510

Mattermost Mobile Apps versions <=2.37 11.4 2.0.37 11.0.4 11.1.3 11.3.2 10.11.11.0 fail to properly validate the SSO authentication callback origin which allows an attacker controlling a malicious Mattermost server to steal user credentials for a legitimate Mattermost server via relaying the SSO code exchange flow through the mobi

MITRE ATT&CK techniques

CredentialsT1589.001

Indicators of compromise

CVE-2026-22880cve

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-22880