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The vulnerability of the Mattermost instant messaging application, related to insufficient checking of unusual or exceptional states, allows a hacker to trigger a service failure.
🗓️ 01 Jun 2026 00:00:00Reported by FSTEC of Russia — Information Security Threat DatabaseType 
bdu_fstec🔗 bdu.fstec.ru👁 1 Views
| Reporter | Title | Published | Views | Family All 13 |
|---|---|---|---|---|
 | CVE-2026-4915 | 25 May 202607:10 | – | attackerkb |
 | Mattermost 安全漏洞 | 25 May 202600:00 | – | cnnvd |
 | CVE-2026-4915 | 25 May 202607:10 | – | cve |
 | CVE-2026-4915 Server panic via outgoing webhook responses | 25 May 202607:10 | – | cvelist |
 | EUVD-2026-31646 | 25 May 202607:10 | – | euvd |
 | Mattermost doesn't filter nil elements from outgoing webhook attachment payloads before processing | 26 May 202613:30 | – | github |
 | CVE-2026-4915 | 25 May 202608:16 | – | nvd |
 | GHSA-5GMF-X7HG-97WF Mattermost doesn't filter nil elements from outgoing webhook attachment payloads before processing | 26 May 202613:30 | – | osv |
 | PT-2026-43013 | 25 May 202600:00 | – | ptsecurity |
 | CVE-2026-4915 | 26 May 202620:14 | – | redhatcve |
10
Node
OROROR
| Source | Link |
|---|---|
| mattermost | www.mattermost.com/security-updates |
| web | www.web.nvd.nist.gov/view/vuln/detail |
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01 Jun 2026 00:00Current
5.8Medium risk
Vulners AI Score5.8
CVSS 36.5
CVSS 26.8
EPSS0.00277