CVE-2026-33002 Details
Description
Jenkins 2.442 through 2.554 (both inclusive), LTS 2.426.3 through LTS 2.541.2 (both inclusive) performs origin validation of requests made through the CLI WebSocket endpoint by computing the expected origin for comparison using the Host or X-Forwarded-Host HTTP request headers, making it vulnerable to DNS rebinding attacks that allow bypassing origin validation.
A vulnerability exists in Jenkins versions 2.442 through 2.554, as well as LTS versions 2.426.3 through 2.541.2. The issue arises because Jenkins performs origin validation for requests made through the Command Line Interface (CLI) WebSocket endpoint by using the Host or X-Forwarded-Host HTTP request headers. This method of validation is vulnerable to DNS rebinding attacks, which can bypass the origin checks. Exploitation of this vulnerability allows attackers to establish WebSocket connections to the CLI endpoint from untrusted origins and execute commands as the anonymous user.
Users are advised to update Jenkins to version 2.555 or LTS 2.541.3. If there are issues with the update, the previous behavior can be restored by setting the Java system property 'hudson.cli.CLIAction.ACCEPT_URL_FROM_REQUEST' to 'true'. For those unable to update, it is recommended to configure authentication for the Jenkins controller and restrict permissions for the anonymous user.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 19, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://www.jenkins.io/security/advisory/2026-03-18/#SECURITY-3674 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-350 | Reliance on Reverse DNS Resolution for a Security-Critical Action | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| jenkins jenkins | >= 2.426.3, < 2.541.3 >= 2.442, < 2.555 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 21, 2026 | Initial Analysis | [email protected] |
| Mar 19, 2026 | CVE Modified | CISA-ADP |
| Mar 18, 2026 | New CVE Received | [email protected] |