What’s Vulnerable › Vulnerabilities
CVE-2024-1402: Denial of service in mattermost mobile apps and server via emoji reactions
- Severity: medium (CVSS 4.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2024-02-09 · updated 2026-06-17
- Weakness: CWE-400
Description
Mattermost fails to check if a custom emoji reaction exists when sending it to a post and to limit the amount of custom emojis allowed to be added in a post, allowing an attacker sending a huge amount of non-existent custom emojis in a post to crash the mobile app of a user seeing the post and to crash the server due to overloading when clients attempt to retrive the aforementioned post.
Affected products
- Mattermost: through 8.1.7; from 9.0.0 through 9.1.4; from 9.2.0 through 9.2.3
References
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