# Jenkins EC2 Fleet Plugin has a missing permission check Advisory record · `GHSA-9v77-j4xv-34gq` - **Identifiers:** `GHSA-9v77-j4xv-34gq` · `CVE-2026-57294` - **State:** Confirmed - **Severity:** CVSS 5.4 Medium - **Critical:** No - **Weakness (CWE):** [CWE-862](https://cwe.mitre.org/data/definitions/862.html) - **Tags:** [Broken access control](https://agentprime.io/advisories/tag/access-control.md) - **Published:** 24 Jun 2026 - **Updated:** 25 Sept 2026 - **Reviewed by a person:** No Published by the GitHub Advisory Database at 24 Jun 2026, 15:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. ## Affected packages - `com.amazon.jenkins.fleet:ec2-fleet` (Maven): affected `<4.2.3.540.va`; fixed in `4.2.3.540.va` ## Machine-written summary Summary written by Claude Haiku from the source advisory. Not reviewed by a person. > The Jenkins EC2 Fleet Plugin (com.amazon.jenkins.fleet:ec2-fleet) versions 4.2.3.539 and earlier are affected. An attacker with Overall/Read permission can exploit missing permission checks in several HTTP endpoints used to validate cloud configurations to send requests to an attacker-specified URL using attacker-specified credential IDs, capturing AWS credentials stored in Jenkins. The endpoints also accept non-POST requests, which enables cross-site request forgery. Upgrade to version 4.2.3.540.va, which requires Overall/Administer permission and POST requests for these actions. Written 2 Nov 2026. ## 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 - 5.4 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N`, from GitHub Advisory Database - **CISA KEV:** Not listed. - **EPSS:** 0.0025, the 17th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days. ## Timeline - 31 Oct 2026, 14:16 UTC: First seen by agentprime - 31 Oct 2026, 14:16 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-9v77-j4xv-34gq) ## Sources - [GitHub Advisory Database: GHSA-9v77-j4xv-34gq](https://github.com/advisories/GHSA-9v77-j4xv-34gq) - [OSV: GHSA-9v77-j4xv-34gq](https://osv.dev/vulnerability/GHSA-9v77-j4xv-34gq) - - - - - - 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 (), 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: - In a browser: reads your lockfile in the browser, never uploading it. - Whether it touches your code, with file and line: the Claude Code plugin, - As JSON: , or `POST https://api.agentprime.io/v1/match` with your packages () --- The web page: . Everything for agents: .