All vulnerabilities
CVE-2021-26085

Atlassian Confluence Server Pre-Authorization Arbitrary File Read Vulnerability

Atlassian Confluence ServerApplications & CMS
Open in ThreatlineRecord JSON
CVSS
5.3Medium
ExploitationExploited in the wildAdded to KEV 28 Mar 2022. Known ransomware useCISA KEV
Exploit odds (EPSS)99.9%Chance of exploitation activity in the next 30 days, higher than 99.9% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in7.4.10Also 7.12.3CVE List
Federal deadline18 Apr 2022Remediation due date for US federal agenciesCISA KEV
CISA required actionApply updates per vendor instructions. CISA KEV

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Timeline

  1. 3 Aug 2021, 00:00 UTCPublishedCVE List
  2. 5 Oct 2021Exploit code publicExploit-DB
  3. 28 Mar 2022Added to CISA KEVCISA KEV

Public exploit code and templates 2

  • Webapps exploitAtlassian Confluence 7.12.2 - Pre-Authorization Arbitrary File Read 5 Oct 2021Exploit-DB
  • Scanner templateAtlassian Confluence Server - Local File InclusionNuclei

Listed so defenders can prioritize. Threatline links to the source and does not host exploit code.

Description

Affected versions of Atlassian Confluence Server allow remote attackers to view restricted resources via a pre-authorization arbitrary file read vulnerability in the /s/ endpoint.

Text from CVE List

Affected versions 6

  • Confluence Serveraffected: unspecified before 7.4.10CVE List
  • Confluence Serveraffected: 7.5.0 before unspecifiedCVE List
  • Confluence Serveraffected: unspecified before 7.12.3CVE List
  • Confluence Data Centeraffected: unspecified before 7.4.10CVE List
  • Confluence Data Centeraffected: 7.5.0 before unspecifiedCVE List
  • Confluence Data Centeraffected: unspecified before 7.12.3CVE List

References 3