CVE-2021-26085: Atlassian Confluence Server Pre-Authorization Arbitrary File Read Vulnerability

CVE-2021-26085 · Severity: critical · CVSS 5.3 · Exploited in the wild · Published 2022-03-28

Atlassian Confluence Server and Data Center are vulnerable to a pre-authorization arbitrary file read via the /s/ endpoint. Remote attackers can exploit this to view restricted resources without authentication.

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

Quick answers

Is CVE-2021-26085 exploited in the wild?
Yes. CVE-2021-26085 is known to be exploited in the wild, first recorded on 28 March 2022. Treat it as urgent.
How severe is CVE-2021-26085?
Critical severity, with a CVSS score of 5.3, published 28 March 2022.
Which products and versions are affected?
Atlassian Confluence Server < 7.4.10, 7.5.0 to < 7.12.3; Atlassian Confluence Data Center < 7.4.10, 7.5.0 to < 7.12.3.
Is there a fix for CVE-2021-26085?
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-2021-26085 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2021-26085?
Check whether you run Atlassian Confluence Data Center or Atlassian Confluence Server. 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 < 7.4.10, 7.5.0 to < 7.12.3
  • Atlassian Confluence Data Center < 7.4.10, 7.5.0 to < 7.12.3

Timeline

  • 2021-08-02: disclosed: NVD Published Date
  • 2022-03-28: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
  • 2022-03-28: advisory: External advisory publication date

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