Is CVE-2021-26085 actively exploited?

Yes. CVE-2021-26085 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-26085 be exploited remotely?

The attack vector of CVE-2021-26085 has not been classified yet.

What is the CVSS score of CVE-2021-26085?

CVE-2021-26085 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-26085

HIGHCISA KEVIN THE WILD

CVE-2021-26085

Published: March 28, 2022

EPSS:93.98%probability of exploitation in 30 daysPercentile:99.9th

Official 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.

NVD Source

CISA KEV Advisory

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.

Added to KEV: 2022-03-28Federal patch deadline: 2022-04-18⚠ USED IN RANSOMWARE CAMPAIGNS

Required Action (CISA)

Apply updates per vendor instructions.

Risk Analysis

This vulnerability in Atlassian Confluence Server allows remote attackers to view restricted resources through a pre-authorization arbitrary file read vulnerability in the /s/ endpoint. The high EPSS score of 0.93977 indicates a very high likelihood of exploitation, making this a critical vulnerability. Its inclusion in CISA's KEV catalog confirms active exploitation.

This vulnerability has been actively exploited in the wild, as confirmed by its exploit status and inclusion in CISA's KEV catalog. The flaw is remotely exploitable by unauthenticated attackers.

Recommended Action

Upgrade Atlassian Confluence Server to a patched version to address the arbitrary file read vulnerability. Ensure Confluence instances are not exposed directly to the internet without proper security controls.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2021-26085 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2021-26085 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.