CVE-2025-31363Network attack vector

Data exfiltration via unrestricted Jira tool requests

Published Apr 16, 2025 · Updated Apr 16, 2025

Data exposure in Mattermost 9.11.0 through 9.11.9, 10.4.0 through 10.4.2, and 10.5.0 allows remote authenticated users to exfiltrate server data. The AI plugin's Jira tool accepts prompt-injected LLM requests without restricting upstream domains, causing the Mattermost server to contact arbitrary reachable systems and disclose returned data. Exploitation requires authentication, crafted content processed by the Jira tool, user interaction, and network reachability from the affected server to the targeted system.

CVSS severity3.0
Low
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Data exposure in Mattermost 9.11.0 through 9.11.9, 10.4.0 through 10.4.2, and 10.5.0 allows remote authenticated users to exfiltrate server data. The AI plugin's Jira tool accepts prompt-injected LLM requests without restricting upstream domains, causing the Mattermost server to contact arbitrary reachable systems and disclose returned data. Exploitation requires authentication, crafted content processed by the Jira tool, user interaction, and network reachability from the affected server to the targeted system.

The record

CVE
CVE-2025-31363
Published
Apr 16, 2025
Updated
Apr 16, 2025
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-201, CWE-497, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 16, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.4.0 <=10.4.2
  2. Affected versionversion=10.5.0
  3. Affected versionversion=9.11.0 <=9.11.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=10.4.0 <=10.4.2; version=10.5.0; version=9.11.0 <=9.11.9

Published CVSS scores

3.0GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-201Insertion of Sensitive Information Into Sent Data
CWE-497Exposure of Sensitive System Information to an Unauthorized Control Sphere
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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