Is CVE-2021-39126 actively exploited?

No active exploitation of CVE-2021-39126 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-39126 be exploited remotely?

Yes. CVE-2021-39126 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-39126?

CVE-2021-39126 has a CVSS score of 6.5 (MEDIUM).

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MEDIUM

CVE-2021-39126

CWE-352Published: October 21, 2021· Updated: Jun 17, 2026

6.5

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-39126 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 6.5.