Insufficient Input Validation on Post Props
Priority LOW 30CWE-1287Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
Mattermost Mobile Apps versions <=2.22.0 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00543 45th 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-2025-21083
- 2026-10-03 Alias added: GHSA-h8hh-7xxw-q4pg
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-2025-14379 Mobile crash via improper validation of proto style in attachments CVSS 3.1HIGH 7.5
Sources
- CVE-2025-21083 · CVE Program
- CVE-2025-21083 · NVD
- FIRST EPSS
- GHSA-h8hh-7xxw-q4pg · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences