# Jenkins has a DNS rebinding vulnerability in WebSocket CLI origin validation

Advisory record · `GHSA-phhv-63fh-rrc8`

- **Identifiers:** `GHSA-phhv-63fh-rrc8` · `BIT-jenkins-2026-33002` · `CVE-2026-33002`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-346](https://cwe.mitre.org/data/definitions/346.html) · [CWE-350](https://cwe.mitre.org/data/definitions/350.html)
- **Tags:** [CWE-346](https://agentprime.io/advisories/tag/cwe-346.md) · [CWE-350](https://agentprime.io/advisories/tag/cwe-350.md)
- **Published:** 18 Mar 2026
- **Updated:** 16 Apr 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 18 Mar 2026, 18:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `org.jenkins-ci.main:jenkins-core` (Maven): affected `>=2.442, <2.555`; fixed in `2.555`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** 0.0028, the 21st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:20 UTC: First seen by agentprime
- 31 Oct 2026, 14:20 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-phhv-63fh-rrc8)

## Sources

- [GitHub Advisory Database: GHSA-phhv-63fh-rrc8](https://github.com/advisories/GHSA-phhv-63fh-rrc8)
- [OSV: GHSA-phhv-63fh-rrc8](https://osv.dev/vulnerability/GHSA-phhv-63fh-rrc8)
- <https://nvd.nist.gov/vuln/detail/CVE-2026-33002>
- <https://github.com/jenkinsci/jenkins/commit/348666da7136ef8270f88c0a7350562b0ba7f8ce>
- <https://github.com/jenkinsci/jenkins>
- <https://www.jenkins.io/security/advisory/2026-03-18/#SECURITY-3674>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-phhv-63fh-rrc8>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-phhv-63fh-rrc8/>. Everything for agents: <https://agentprime.io/llms.txt>.