Home / Vulnerabilities / CVE-2021-26085
MEDIUM SEVERITY Ransomware Linked
CVE-2021-26085 Atlassian · Confluence Server

Atlassian Confluence Server Pre-Authorization Arbitrary File Read Vulnerability

Critical Threat Advisory: This vulnerability is documented in active Ransomware campaigns. Immediate remediation required.

Technical Severity

CVSS v3.1 Metrics

MEDIUM
5.3 / 10
Minimal Risk Critical
Vector Specification
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Exploitation Likelihood

EPSS Prediction

94.01 %
Predictive Probability
Percentile Rank
99.9 th

Documented as more likely to be exploited than 99.9% of known CVEs.

Detection Date

Mar 28, 2022

Remediation Due

Apr 18, 2022

CISA Catalog Active

Threat Analysis

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.

Remediation Directive

Apply updates per vendor instructions.

External Intelligence

NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2021-26085