CVE-2022-26134
Published: 03 June 2022
Summary
CVE-2022-26134 is a critical-severity Expression Language Injection (CWE-917) vulnerability in Atlassian Confluence Data Center. Its CVSS base score is 9.8 (Critical).
Operationally, ranked in the top 0.0% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2022-26134 is an OGNL injection vulnerability in Atlassian Confluence Server and Data Center that permits unauthenticated remote code execution. The flaw affects versions 1.3.0 through 7.4.16, 7.13.0 through 7.13.6, 7.14.0 through 7.14.2, 7.15.0 through 7.15.1, 7.16.0 through 7.16.3, 7.17.0 through 7.17.3, and 7.18.0, all prior to the respective fixed releases 7.4.17, 7.13.7, 7.14.3, 7.15.2, 7.16.4, 7.17.4, and 7.18.1. It carries a CVSS 3.1 base score of 9.8 and is tracked under CWE-917.
An unauthenticated attacker with network access can supply a crafted OGNL expression in an HTTP request to the Confluence instance, resulting in arbitrary code execution with the privileges of the Confluence process. Successful exploitation grants full control over the server, including the ability to read or modify any data, install persistent backdoors, or pivot within the environment.
Public proof-of-concept exploits have been posted to Packet Storm, and the current EPSS score of 0.9441 (with a recorded peak of 0.9755) indicates sustained exploitation interest following disclosure. The vendor advisory at confluence.atlassian.com recommends immediate upgrade to one of the fixed versions listed above.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2022-30701
Vulnerability details
In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an unauthenticated attacker to execute arbitrary code on a Confluence Server or Data Center instance. The affected versions are from 1.3.0 before 7.4.17,…
more
from 7.13.0 before 7.13.7, from 7.14.0 before 7.14.3, from 7.15.0 before 7.15.2, from 7.16.0 before 7.16.4, from 7.17.0 before 7.17.4, and from 7.18.0 before 7.18.1.
- CWE(s)
- KEV Date Added
- 02 June 2022
Related Threats
Threat-Actor AttributionAI
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly blocks the OGNL injection payload from unauthenticated remote attackers by validating all input to Confluence endpoints before expression evaluation occurs.
Requires prompt application of the vendor patches that close the OGNL injection flaw in all listed vulnerable Confluence versions.
Limits the set of actions (including arbitrary code paths) that can be performed by unauthenticated users, reducing the attack surface exploited by CVE-2022-26134.