Is CVE-2025-31363 in the CISA KEV catalog?

No. CVE-2025-31363 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-31363?

CVE-2025-31363 has a CVSS v3 base score of 3.0 (LOW).

What is the EPSS score for CVE-2025-31363?

CVE-2025-31363 has an EPSS score of 0.23% (13th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-31363?

Upgrade mattermost server to 10.4.3 or later.

CVE & CISA-KEV Catalog

CVE-2025-31363

LOW

3.0

CVSS v3

NVD

Description

Mattermost versions 10.4.x <= 10.4.2, 10.5.x <= 10.5.0, 9.11.x <= 9.11.9 fail to restrict domains the LLM can request to contact upstream which allows an authenticated user to exfiltrate data from an arbitrary server accessible to the victim via performing a prompt injection in the AI plugin's Jira tool.

How to fix

Remediation Available

mattermost serverNVD

Affected:>= 10.4.0, < 10.4.3Fixed in:10.4.3CVE-2025-31363derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredLow

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:N/A:N

Exploit Intelligence

0.23%probability of exploitation in 30 days

13thpercentile

Low risk: more likely to be exploited than 13% of all known CVEs.

References

Vendor Advisory1

mattermost.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-09-29.