The vulnerability of the notification handler of the Instant Messaging application Mattermost, which allows a violator to cause a service failure
🗓️ 01 Jun 2026 00:00:00Reported by FSTEC of Russia — Information Security Threat DatabaseType 
bdu_fstec🔗 bdu.fstec.ru👁 7 Views
| Reporter | Title | Published | Views | Family All 17 |
|---|---|---|---|---|
 | CVE-2026-4635 | 22 May 202610:28 | – | attackerkb |
 | CVE-2026-4635 | 22 May 202612:47 | – | circl |
 | Mattermost 安全漏洞 | 22 May 202600:00 | – | cnnvd |
 | CVE-2026-4635 | 22 May 202610:28 | – | cve |
 | CVE-2026-4635 Persistent notification timing attack causing server denial of service | 22 May 202610:28 | – | cvelist |
 | EUVD-2026-31431 | 22 May 202610:28 | – | euvd |
 | Mattermost doesn't archive the channel before removing persistent notifications | 26 May 202613:30 | – | github |
 | CVE-2026-4635 | 22 May 202611:16 | – | nvd |
 | GHSA-PG7C-462J-GRXV Mattermost doesn't archive the channel before removing persistent notifications | 26 May 202613:30 | – | osv |
| GO-2026-5820 Mattermost doesn't archive the channel before removing persistent notifications in github.com/mattermost/mattermost-server | 7 Jul 202615:26 | – | osv |
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| Source | Link |
|---|---|
| mattermost | www.mattermost.com/security-updates |
| vuldb | www.vuldb.com/vuln/365182 |
| 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
EPSS0.00172