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CVE-2021-26085

Atlassian — Atlassian Confluence Server Pre-Authorization Arbitrary File Read Vulnerability

Atlassian · CWE-425 · in CISA KEV since 2022-03-28

KEV since 2022 · listed over a yearRansomwareCISA KEVActively Exploited
88

EVRS 88 of 100 Immediate

Patch Immediately

Rank 165 of 2,960 tracked

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Why it scores 88

Evidence available: 6 of 7 signals

Listed in the CISA KEV catalog, and associated with known ransomware campaigns.

  • CISA KEVApplied
  • RansomwareApplied
  • Vendor exploitationDid not apply
  • EPSSApplied
  • Microsoft Exploitability IndexNot applicable
  • Pre-patch disclosureNo data
  • KEV recencyDid not apply
  • CVSSApplied

The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data

Fix

Patch or fixed version identified

CISA required action

Fixed in

confluence data center: update to 7.4.10 or later | confluence data center: update to 7.12.3 or later | confluence server: update to 7.4.10 or later | confluence server: update to 7.12.3 or later

Affected versions

  • confluence data center< 7.4.10>= 7.5.0 < 7.12.3
  • confluence server< 7.4.10>= 7.5.0 < 7.12.3

Remediation

Apply updates per vendor instructions.

Fixed versions from NVD.

Evidence

Each value with its source
MeasureValueSource
CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. 5.3 NVD
FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. 0.999 (99.97th pctl) FIRST EPSS
Actively exploitedWhether a source of record has confirmed attacks using it in the wild. Confirmed CISA KEV
Ransomware campaign useWhether CISA has seen ransomware operators use it. Known CISA KEV
CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. 2022-04-18 · KEV since 2022 · listed over a year CISA KEV
Public exploit moduleA module existing is not the same as active exploitation. None known Metasploit
EUVD cross-referenceENISA's record: CVSS 5.3 (v3.1), assigned by atlassian. Listed ENISA EUVD

Description

NVD

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. The affected versions are before version 7.4.10, and from version 7.5.0 before 7.12.3.

What CISA says to do