Actively exploited · Published Oct 4, 2023 · Assigned by atlassian

CVE-2023-22515

Critical 10.0 Exploited Ransomware

In plain English

A critical-severity improper input validation in Confluence Data Center from Atlassian. Attackers are actively exploiting it in the wild (listed by CISA on October 5, 2023). It has been used in ransomware campaigns. The chance it is exploited in the next 30 days is estimated at 99.2% (higher than 99.9% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit, Nuclei, public proof-of-concept code. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Check all affected Confluence instances for evidence of compromise per vendor instructions and report any positive findings to CISA.

Severity (CVSS 3.0)10.0Critical

Exploit odds (30 days)99.2%top 0.1% of all CVEs

Exploited in the wildYesCISA KEV since Oct 5, 2023

Attack tooling3Metasploit, Nuclei, Public PoC

CISA guidance

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Check all affected Confluence instances for evidence of compromise per vendor instructions and report any positive findings to CISA.

Federal agencies must remediate by Oct 13, 2023.

Official description

Atlassian has been made aware of an issue reported by a handful of customers where external attackers may have exploited a previously unknown vulnerability in publicly accessible Confluence Data Center and Server instances to create unauthorized Confluence administrator accounts and access Confluence instances. Atlassian Cloud sites are not affected by this vulnerability. If your Confluence site is accessed via an atlassian.net domain, it is hosted by Atlassian and is not vulnerable to this issue.

Affected products (as reported)

Vendor	Product	Versions
Atlassian	Confluence Data Center	>= 8.0.0>= 8.0.1>= 8.0.2>= 8.0.3>= 8.1.3>= 8.1.4>= 8.2.0
Atlassian	Confluence Server	>= 8.0.0>= 8.0.1>= 8.0.2>= 8.0.3>= 8.1.3>= 8.1.4>= 8.2.0

Weakness: CWE-20 · Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H