Mattermost allows attackers to take over arbitrary user accounts via overly permissive substring matching flaw
| Reporter | Title | Published | Views | Family All 17 |
|---|---|---|---|---|
 | CVE-2026-27656 | 25 Mar 202616:28 | – | attackerkb |
 | CVE-2026-27656 | 26 Mar 202603:00 | – | circl |
 | Mattermost security vulnerabilities | 25 Mar 202600:00 | – | cnnvd |
 | CVE-2026-27656 | 25 Mar 202616:28 | – | cve |
 | CVE-2026-27656 Account Takeover via Substring Matching in OpenID Connect Authentication | 25 Mar 202616:28 | – | cvelist |
 | EUVD-2026-15805 | 25 Mar 202618:31 | – | euvd |
 | CVE-2026-27656 | 25 Mar 202616:28 | – | mend |
 | CVE-2026-27656 | 25 Mar 202617:16 | – | nvd |
 | GHSA-FG35-5RF6-QG3G Mattermost allows attackers to take over arbitrary user accounts via overly permissive substring matching flaw | 25 Mar 202618:31 | – | osv_ghsa |
| GO-2026-5360 Mattermost allows attackers to take over arbitrary user accounts via overly permissive substring matching flaw in github.com/mattermost/mattermost-server | 25 Jun 202618:43 | – | osv_go |
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31 Mar 2026 05:19Current
8.3High risk
Vulners AI Score8.3
CVSS 3.15.7 - 6.1
EPSS0.00324
SSVC