CVE-2026-18730: Software Security Vulnerability Vulnerability
HIGHCVE-2026-18730 is a HIGH (CVSS 7.4) security vulnerability vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting Software libraries in the Maven ecosystem. The weakness occurs when the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination.. Remediation is available in the latest vendor maintenance releases.
CVE-2026-18730 at a Glance
Security Impact
CVSS: 7.4
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N).
How to Fix CVE-2026-18730
To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:treeHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2026-18730, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:treeAnalyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.
Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-918: Server-Side Request Forgery (SSRF), where the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
References
Frequently Asked Questions
What is CVE-2026-18730?
Which Software versions are affected?
What version fixes CVE-2026-18730?
What is the CVSS score of CVE-2026-18730?
What CWE is associated with CVE-2026-18730?
How can I check Maven dependencies for CVE-2026-18730?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-xh7g-7v3x-h73p",
"modified" : "2026-09-22T21:30:32Z",
"published" : "2026-09-02T00:31:29Z",
"aliases" : [ "CVE-2026-18730" ],
"details" : "A server-side request forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to cause the Manage API to send crafted outbound requests to an attacker-controlled host. An unauthenticated endpoint parsed an attacker-supplied cluster configuration and issued gateway-to-agent requests whose HMAC authenticated only a timestamp, not the request path or body. An attacker positioned to intercept the outbound request could capture this token and replay it against privileged management agent endpoints. High-availability deployments were not affected due to a topology restriction. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.17.19, 3.18.13, 3.19.10, 3.20.6, and 3.21.4. This vulnerability was reported via the GitHub Bug Bounty program.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
}, {
"type" : "CVSS_V4",
"score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
} ],
"affected" : [ ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-18730"
}, {
"type" : "WEB",
"url" : "https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.19"
}, {
"type" : "WEB",
"url" : "https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.21"
}, {
"type" : "WEB",
"url" : "https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.13"
}, {
"type" : "WEB",
"url" : "https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.15"
}, {
"type" : "WEB",
"url" : "https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.10"
}, {
"type" : "WEB",
"url" : "https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.12"
}, {
"type" : "WEB",
"url" : "https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.6"
}, {
"type" : "WEB",
"url" : "https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.8"
}, {
"type" : "WEB",
"url" : "https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.4"
}, {
"type" : "WEB",
"url" : "https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.6"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-918" ],
"severity" : "HIGH",
"github_reviewed" : false,
"github_reviewed_at" : null,
"nvd_published_at" : "2026-09-01T22:17:10Z"
}
}