CVE Explorer
CVE-2026-10819
Mattermost versions 11.6.x <= 11.6.5, 10.11.x <= 10.11.20, 11.8.x <= 11.8.1, 11.7.x <= 11.7.4 fail to limit the number of frames and enforce the file size cap on animated GIF uploads, which allows an authenticated attacker to cause a denial of service via a crafted animated GIF uploaded as a custom emoji.. Mattermost Advisory ID: MMSA-2026-00695
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":"11.6.5","status":"affected","version":"11.6.0","versionType":"semver"},{"lessThanOrEqual":"10.11.20","status":"affected","version":"10.11.0","versionType":"semver"},{"lessThanOrEqual":"11.8.1","status":"affected","version":"11.8.0","versionType":"semver"},{"lessThanOrEqual":"11.7.4","status":"affected","version":"11.7.0","versionType":"semver"},{"status":"unaffected","version":"11.9.0"},{"status":"unaffected","version":"11.6.6"},{"status":"unaffected","version":"10.11.21"},{"status":"unaf…
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:22e5fb17753ff61d27b2829ada415de8502a84ef0ef1724e9d3d9773b08d328a · sha256:1e9200e643865eef… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"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:H","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:22e5fb17753ff61d27b2829ada415de8502a84ef0ef1724e9d3d9773b08d328a · sha256:1e9200e643865eef… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-409","description":"CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:22e5fb17753ff61d27b2829ada415de8502a84ef0ef1724e9d3d9773b08d328a · sha256:1e9200e643865eef… · /containers/cna/problemTypes/0/descriptions/0
Source references
1 source assertion{"name":"MMSA-2026-00695","tags":["vendor-advisory"],"url":"https://mattermost.com/security-updates"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:22e5fb17753ff61d27b2829ada415de8502a84ef0ef1724e9d3d9773b08d328a · sha256:1e9200e643865eef… · /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.