What’s Vulnerable › Vulnerabilities
CVE-2023-40703: Denial of Service via specially crafted block fields in Mattermost Boards
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.7% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2023-11-27 · updated 2026-06-17
- Weakness: CWE-400
Description
Mattermost fails to properly limit the characters allowed in different fields of a block in Mattermost Boards allowing a attacker to consume excessive resources, possibly leading to Denial of Service, by patching the field of a block using a specially crafted string.
Affected products
- Mattermost App Framework: through 7.8.12; from 8.0.0 through 8.1.3; from 9.0.0 through 9.0.1; 9.1.0
References
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