What’s Vulnerable › Vulnerabilities
CVE-2023-5522: Mobile app freezes when receiving a post with hundreds of emojis
- Severity: medium (CVSS 4.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2023-10-17 · updated 2026-06-17
- Weakness: CWE-400
Description
Mattermost Mobile fails to limit the maximum number of Markdown elements in a post allowing an attacker to send a post with hundreds of emojis to a channel and freeze the mobile app of users when viewing that particular channel.
Affected products
- Mattermost App Framework: before 2.8.0 — fixed in 2.8.0
How to fix
Upgrade to a fixed version: Mattermost App Framework 2.8.0. Check the vendor advisory for mitigations.
References
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