CVE Explorer
CVE-2026-20719
Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to prevent rendering of external SVGs on link embeds which allows unauthenticated users to crash the Mattermost webapp and desktop app via creating an issue or PR on GitHub.. Mattermost Advisory ID: MMSA-2026-00595
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","product":"Mattermost","vendor":"Mattermost","versions":[{"lessThanOrEqual":"11.4.0","status":"affected","version":"11.4.0","versionType":"semver"},{"lessThanOrEqual":"11.3.1","status":"affected","version":"11.3.0","versionType":"semver"},{"lessThanOrEqual":"11.2.3","status":"affected","version":"11.2.0","versionType":"semver"},{"lessThanOrEqual":"10.11.11","status":"affected","version":"10.11.0","versionType":"semver"},{"status":"unaffected","version":"11.5.0"},{"status":"unaffected","version":"11.4.1"},{"status":"unaffected","version":"11.3.2"},{"status":"unaffe…
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:421fc3b6ca753e84f47671c3b36f637cf17a86e90e823a0ebdfed491731631ef · sha256:eafd2ad7270a9e72… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:421fc3b6ca753e84f47671c3b36f637cf17a86e90e823a0ebdfed491731631ef · sha256:eafd2ad7270a9e72… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-754","description":"CWE-754: Improper Check for Unusual or Exceptional Conditions","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:421fc3b6ca753e84f47671c3b36f637cf17a86e90e823a0ebdfed491731631ef · sha256:eafd2ad7270a9e72… · /containers/cna/problemTypes/0/descriptions/0
Source references
1 source assertion{"name":"MMSA-2026-00595","tags":["vendor-advisory"],"url":"https://mattermost.com/security-updates"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:421fc3b6ca753e84f47671c3b36f637cf17a86e90e823a0ebdfed491731631ef · sha256:eafd2ad7270a9e72… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.