Patch ASAP: Max-Critical Atlassian Bug Allows Unauthenticated RCE

Rated at a CVSS score of 10, the bug is as bad as it gets, allowing remote cyberattackers unfettered access to corporate environments.

A max-critical unauthenticated remote code execution (RCE) vulnerability is impacting Atlassian Confluence Data Center and Confluence Server, in all versions released before Dec. 5. Unpatched organizations should prepare to defend against everything from ransomware campaigns to cyber-espionage attempts.
The bug (
CVE-2023-22527
), which carries a 10 out of 10 vulnerability-severity rating on the CVSS v3 scale, is a template injection vulnerability that paves the way for unauthenticated attackers to achieve RCE on versions 8.0.x, 8.1.x, 8.2.x, 8.3.x, 8.4.x, and 8.5.0 through 8.5.3.
Any organization that has upgraded to
Confluence versions released in the companys December update
are in the clear, though the bug was disclosed just today, along with several less-severe vulnerabilities that are newly patched in
a fresh security bulletin
.
Atlassian noted that end-of-life instances (version 8.4.5 and before) are also affected and will not receive patches.
There are no mitigations or workarounds available, so admins should apply the latest versions from last month to be fully protected, even if their versions of Confluence arent exposed to the Internet. Cloud instances are unaffected.
For those who cant immediately patch their Confluence Data Center and Server instances, Atlassian recommends they remove their systems from the Internet and back up their data outside of the Confluence environment.
The company also suggested monitoring for any potential malicious activity (naturally) but noted in its
security advisory on CVE-2024-22527
that the possibility of multiple entry points, along with chained attacks, makes it difficult to list all possible indicators of compromise.
Admins should take note: Atlassian Confluence bugs are
generally popular on the cybercrime circuit
, given that the platform reaches deep into network environments, used for cross-enterprise collaboration, workflow, and software development. Another
10-out-of-10 critical bug in November
was swarmed with exploitation attempts within days of its disclosure, and its likely the same will hold true for this one if past is prologue; with
Atlassian, it usually is
.

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Patch ASAP: Max-Critical Atlassian Bug Allows Unauthenticated RCE