Security Experts:

Connect with us

Hi, what are you looking for?



Recently Patched Confluence Vulnerability Exploited in the Wild

Hackers started exploiting a vulnerability in Atlassian’s Confluence enterprise collaboration product just one week after the availability of a patch was announced.

Hackers started exploiting a vulnerability in Atlassian’s Confluence enterprise collaboration product just one week after the availability of a patch was announced.

Atlassian informed customers on August 25 that Confluence is affected by a critical vulnerability — described as an OGNL injection issue — that can allow remote attackers to execute arbitrary code on impacted Confluence Server and Data Center instances.

The flaw, tracked as CVE-2021-26084, can in some cases be exploited without authentication. Patches are included in versions 6.13.23, 7.4.11, 7.11.6, 7.12.5 and 7.13.0.

On August 29, researchers said it was easier than expected to reproduce the exploit. On September 1, cybersecurity companies started seeing internet scans aimed at identifying vulnerable systems, as well as exploitation attempts.

Threat intelligence company Bad Packets has observed attacks exploiting CVE-2021-26084 to deliver cryptocurrency miners.

CVE-2021-26084 exploited

After the first in-the-wild exploitation attempts were spotted, researchers released a technical analysis of the vulnerability and proof-of-concept (PoC) exploit code, which will likely lead to even more threat groups adding the Confluence vulnerability to their arsenal.

Government cybersecurity agencies started issuing alerts for CVE-2021-26084 after the first exploitation attempts were observed.

Both profit-driven cybercriminals and state-sponsored threat actors have been known to target vulnerabilities in Atlassian products.

Related: Atlassian Patches Critical Vulnerability in Jira Data Center Products

Related: Researchers Detail Exploit Chain for Hijacking Atlassian Accounts

Related: AESDDoS Botnet Targets Vulnerability in Atlassian’s Confluence Server

Written By

Eduard Kovacs (@EduardKovacs) is a contributing editor at SecurityWeek. He worked as a high school IT teacher for two years before starting a career in journalism as Softpedia’s security news reporter. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering.

Click to comment

Expert Insights

Related Content


Zendesk is informing customers about a data breach that started with an SMS phishing campaign targeting the company’s employees.


The release of OpenAI’s ChatGPT in late 2022 has demonstrated the potential of AI for both good and bad.


The FBI dismantled the network of the prolific Hive ransomware gang and seized infrastructure in Los Angeles that was used for the operation.

Malware & Threats

Microsoft plans to improve the protection of Office users by blocking XLL add-ins from the internet.

Cloud Security

VMware vRealize Log Insight vulnerability allows an unauthenticated attacker to take full control of a target system.

IoT Security

Lexmark warns of a remote code execution (RCE) vulnerability impacting over 120 printer models, for which PoC code has been published.


A new study by McAfee and the Center for Strategic and International Studies (CSIS) named a staggering figure as the true annual cost of...

Mobile & Wireless

Apple rolled out iOS 16.3 and macOS Ventura 13.2 to cover serious security vulnerabilities.