CVE-2021-26084: Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection Vulnerability

CVE-2021-26084 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2021-11-03

Atlassian Confluence Server and Data Center are vulnerable to an Object-Graph Navigation Language (OGNL) injection. An unauthenticated remote attacker can exploit this vulnerability to execute arbitrary code on the affected instance.

Technologies: Atlassian Confluence Server, Atlassian Data Center. Vendors: Atlassian.

Quick answers

Is CVE-2021-26084 exploited in the wild?
Yes. CVE-2021-26084 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.
How severe is CVE-2021-26084?
Critical severity, with a CVSS score of 9.8, published 3 November 2021.
Which products and versions are affected?
Atlassian Confluence Server before 6.13.23, 6.14.0 to 7.4.11, 7.5.0 to 7.11.6, 7.12.0 to 7.12.5; Atlassian Confluence Data Center before 6.13.23, 6.14.0 to 7.4.11, 7.5.0 to 7.11.6, 7.12.0 to 7.12.5.
Is there a fix for CVE-2021-26084?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2021-26084 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2021-26084?
Check whether you run Atlassian Confluence Server or Atlassian Data Center. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Atlassian Confluence Server before 6.13.23, 6.14.0 to 7.4.11, 7.5.0 to 7.11.6, 7.12.0 to 7.12.5
  • Atlassian Confluence Data Center before 6.13.23, 6.14.0 to 7.4.11, 7.5.0 to 7.11.6, 7.12.0 to 7.12.5

Timeline

  • 2021-11-03: disclosed: Vulnerability published and added to CISA KEV catalog.
  • 2021-11-03: kev added
  • 2021-11-03: exploited: Reported as exploited in the wild.

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