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Vulnerability record · CVE-2021-22869 · published 24 September 2021

CVE-2021-22869: Github enterprise server exposure of resource to wrong sphere vulnerability

Github · Enterprise Server

An improper access control vulnerability in GitHub Enterprise Server allowed a workflow job to execute in a self-hosted runner group it should not have had access to. This affects customers using self-hosted runner groups for access control. A repository with access to one enterprise runner group could access all of the enterprise runner groups within the organization because of improper authentication checks during the request. This could cause code to be run unintentionally by the incorrect runner group. This vulnerability affected GitHub Enterprise Server versions from 3.0.0 to 3.0.15 and 3.1.0 to 3.1.7 and was fixed in 3.0.16 and 3.1.8 releases.

9.8 CVSS 3.1 Critical EPSS 1.2% · top 33.1% CWE-668 · Exposure of resource to wrong sphereCWE-287 · Improper authentication
9.8CVSS 3.1 base score, v2 7.5
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

An improper access control vulnerability in GitHub Enterprise Server allowed a workflow job to execute in a self-hosted runner group it should not have had access to. This affects customers using self-hosted runner groups for access control. A repository with access to one enterprise runner group could access all of the enterprise runner groups within the organization because of improper authentication checks during the request. This could cause code to be run unintentionally by the incorrect runner group. This vulnerability affected GitHub Enterprise Server versions from 3.0.0 to 3.0.15 and 3.1.0 to 3.1.7 and was fixed in 3.0.16 and 3.1.8 releases.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://docs.github.com/en/enterprise-server%403.0/admin/release-notes#3.0.16
https://docs.github.com/en/enterprise-server%403.1/admin/release-notes#3.1.8
https://docs.github.com/en/enterprise-server%403.0/admin/release-notes#3.0.16
https://docs.github.com/en/enterprise-server%403.1/admin/release-notes#3.1.8

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-22869), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.