Mobile crash via improper validation of proto style in attachments
Priority LOW 34CWE-704Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-704 and the CVSS impact.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00549 46th percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 2.23.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Mattermost | Mattermost | up to 2.22.0 | 2.23.0 | Patch available | CNA |
- Mattermost VendorMattermost Affected up to 2.22.0 Fixed in 2.23.0 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:mattermost_mobile:*:*:*:*:*:*:*:* | before 2.23.0 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:mattermost_mobile:*:*:*:*:*:*:*:* Versions before 2.23.0 Vulnerable ·Mattermost
Remediation
- Fix · CNA Mattermost (Mattermost) Fixed in 2.23.0
Timeline
- 2026-10-02 Threatist record created from CVE-2025-20072
- 2026-10-03 Alias added: GHSA-778q-j98c-h63p
References
Advisory 1
More Mattermost Mobile vulnerabilities
- TI-2020-11312 An issue was discovered in Mattermost Mobile Apps before 1.29.0. CVSS 3.1HIGH 7.5
- TI-2020-11310 An issue was discovered in Mattermost Mobile Apps before 1.30.0. CVSS 3.1HIGH 7.5
- TI-2019-15070 An issue was discovered in Mattermost Mobile Apps before 1.26.0. CVSS 3.1HIGH 7.5
- TI-2019-15066 An issue was discovered in Mattermost Mobile Apps before 1.26.0. CVSS 3.1HIGH 7.5
- TI-2025-14702 Mobile crash via object that can't be cast to String in Attachment Field CVSS 3.1HIGH 7.5
- TI-2025-21792 Unauthorized Notification Exposure in Mobile App Under Specific Conditions CVSS 3.1HIGH 7.5
Sources
- CVE-2025-20072 · CVE Program
- CVE-2025-20072 · NVD
- FIRST EPSS
- GHSA-778q-j98c-h63p · GitHub Advisory Database · CC BY 4.0
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