Risk Letters

Exploited vulnerability

CVE-2021-26085

TLP:CLEAR

Atlassian Confluence Server Pre-Authorization Arbitrary File Read Vulnerability

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.

Facts

  • Vendor: Atlassian
  • Product: Confluence Server
  • CVSS: 5.3
  • EPSS (probability of exploitation within 30 days): 99.9 %
  • On CISA's Known Exploited Vulnerabilities list since: 28 March 2022
  • First known exploitation: 28 March 2022
  • Used in ransomware campaigns (per CISA): Yes
  • CISA's deadline for US federal agencies: 18 April 2022
  • Weakness: CWE-425
  • First seen by Risk Letters: 28 March 2022

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD