CVE-2022-26134
About
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, 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.
Rainforest analyst review
An OGNL injection flaw in Confluence Server and Data Center lets an unauthenticated attacker put an Object-Graph Navigation Language expression into a request URL that Confluence then evaluates server-side. Because OGNL expressions can call arbitrary Java, that evaluation becomes arbitrary code execution in the context of the Confluence process, with no login and no user interaction. A single crafted GET request is enough to run commands and drop a web shell.
This was exploited as a zero-day before Atlassian shipped a fix, and mass scanning followed within days of disclosure, so any instance that was internet-facing during that window should be assumed touched, not merely patched. Confluence tends to hold an organization's internal documentation, credentials, and integration secrets, making it a high-value pivot point rather than an isolated app. Upgrade to a fixed release, then hunt: look for unexpected child processes of the web server, newly written JSP/web shell files under the Confluence webroot, and outbound connections from the host. Rotate any credentials or tokens that lived on or were reachable from that server.
References
- http://packetstormsecurity.com/files/167430/Confluence-OGNL-Injection-Remote-Code-Execution.html
- http://packetstormsecurity.com/files/167431/Through-The-Wire-CVE-2022-26134-Confluence-Proof-Of-Concept.html
- http://packetstormsecurity.com/files/167432/Confluence-OGNL-Injection-Proof-Of-Concept.html
- http://packetstormsecurity.com/files/167449/Atlassian-Confluence-Namespace-OGNL-Injection.html
- https://confluence.atlassian.com/doc/confluence-security-advisory-2022-06-02-1130377146.html
- https://jira.atlassian.com/browse/CONFSERVER-79016
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-26134
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Frequently asked questions
What is CVE-2022-26134?
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.
How severe is CVE-2022-26134?
CVE-2022-26134 carries a CVSS 3.1 base score of 9.8, rated critical. On the Rainforest Risk Index — which weighs the severity alongside how easy the flaw is to reach and how broad its impact is — it scores 99 out of 100, in the critical band.
How is CVE-2022-26134 exploited?
According to the CVSS vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H): attack vector Network, attack complexity Low, privileges required None, user interaction None. Impact on confidentiality High, integrity High and availability High.
Which products are affected by CVE-2022-26134?
Public advisories list the following as affected: confluence data center, confluence server. Check the references on this page for the exact versions each vendor confirms.
How do I fix CVE-2022-26134?
Apply the fix the vendor published — the references on this page link to the primary advisories and patches. When patching can't happen right away, reduce the exposure of the affected component and watch it for exploitation attempts. Rainforest customers see this vulnerability correlated to their own assets and prioritized by real exposure, not by score alone.
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