Is CVE-2021-26084 actively exploited?

Yes. CVE-2021-26084 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-26084 be exploited remotely?

The attack vector of CVE-2021-26084 has not been classified yet.

What is the CVSS score of CVE-2021-26084?

CVE-2021-26084 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-26084

HIGHCISA KEVIN THE WILD

CVE-2021-26084

Published: November 3, 2021

EPSS:94.44%probability of exploitation in 30 daysPercentile:100.0th

Official Description

Atlassian Confluence Server and Data Server contain an Object-Graph Navigation Language (OGNL) injection vulnerability that may allow an unauthenticated attacker to execute code.

NVD Source

CISA KEV Advisory

Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection Vulnerability

Atlassian Confluence Server and Data Server contain an Object-Graph Navigation Language (OGNL) injection vulnerability that may allow an unauthenticated attacker to execute code.

Added to KEV: 2021-11-03Federal patch deadline: 2021-11-17⚠ USED IN RANSOMWARE CAMPAIGNS

Required Action (CISA)

Apply updates per vendor instructions.

Risk Analysis

Atlassian Confluence Server and Data Center are vulnerable to an Object-Graph Navigation Language (OGNL) injection flaw, which can allow an unauthenticated attacker to execute code. The high EPSS score of 0.94440 indicates a very high likelihood of exploitation, making this a critical vulnerability. This flaw is actively exploited.

This vulnerability is actively exploited in the wild and is included in CISA's KEV catalog. The flaw is remotely exploitable by an unauthenticated attacker.

Recommended Action

Apply the latest security updates from Atlassian for Confluence Server and Data Center to mitigate this OGNL injection vulnerability. Regularly review and harden Confluence configurations.

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-2021-26084 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-2021-26084 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.