What’s Vulnerable › Vulnerabilities

CVE-2025-20630: Mobile crash via object that can't be cast to String in Attachment Field

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-01-16 · updated 2026-06-17
• Weakness: CWE-1287

Description

Mattermost Mobile versions <=2.22.0 fail to properly handle posts with attachments containing fields that cannot be cast to a String, which allows an attacker to cause the mobile to crash via creating and sending such a post to a channel.

Affected products

• Mattermost Mobile: before 2.23.0 — fixed in 2.23.0

How to fix

Upgrade to a fixed version: Mattermost Mobile 2.23.0. Check the vendor advisory for mitigations.

References

• https://mattermost.com/security-updates

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