#VU56249 Code Injection in Confluence Server - CVE-2021-26084
Published: September 1, 2021 / Updated: March 17, 2023
Vulnerability identifier: #VU56249
Vulnerability risk: High
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber
CVE-ID: CVE-2021-26084
CWE-ID: CWE-94
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerable software:
Confluence Server
Confluence Server
Software vendor:
Atlassian
Atlassian
Description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to improper input validation. A remote attacker can send a specially crafted request, perform the OGNL injection and execute arbitrary code on the system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system but requires that the "Allow people to sign up to create their account" option is enabled.
Note, as of September 3 the vulnerability is being actively exploited in the wild.
Remediation
Install updates from vendor's website.