CVE-2025-20072: Mobile crash via improper validation of proto style in attachments

Severity: high (CVSS 7.5 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: 2025-01-16 · updated 2026-06-17
Weakness: CWE-704

Description

Mattermost Mobile versions <= 2.22.0 fail to properly validate the style of proto supplied to an action's style in post.props.attachments, which allows an attacker to crash the mobile via crafted malicious input.

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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