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Mattermost: Authenticated DoS through failure to prevent rendering of external SVGs on link embeds

🗓️ 25 Mar 2026 18:31:48Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 2 Views

Mattermost suffers authenticated denial of service by rendering external SVGs in link embeds, crashing web and desktop apps.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
Circl
CVE-2026-20719
25 Mar 202618:12
circl
CNNVD
Mattermost 安全漏洞
25 Mar 202600:00
cnnvd
CVE
CVE-2026-20719
25 Mar 202616:30
cve
Cvelist
CVE-2026-20719 DoS via URL Previews Rendering Malicious SVGs
25 Mar 202616:30
cvelist
EUVD
EUVD-2026-15485
25 Mar 202618:31
euvd
NVD
CVE-2026-20719
25 Mar 202617:16
nvd
OSV
GHSA-86VC-MG26-FJ6X Mattermost: Authenticated DoS through failure to prevent rendering of external SVGs on link embeds
25 Mar 202618:31
osv
Positive Technologies
PT-2026-27810
25 Mar 202600:00
ptsecurity
RedhatCVE
CVE-2026-20719
26 Mar 202617:00
redhatcve
Snyk
Improper Check for Unusual or Exceptional Conditions
25 Mar 202618:31
snyk
Rows per page
Vulners
Node
mattermostmattermostRange10.11.0-rc110.11.2go
OR
mattermostmattermostRange8.0.0-20260105080200-d27a2195068d8.0.0-20260217110922-b7d4a1f1f59bgo
OR
mattermostmattermostRange11.2.0-rc111.2.4go
OR
mattermostmattermostRange11.3.0-rc111.3.2go
OR
mattermostmattermostRange11.4.0-rc111.4.1go

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30 Mar 2026 22:21Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.14.3 - 7.5
EPSS0.00072
SSVC
2