AEGLIX vulnerability intelligence
CVE-2026-5921
HIGH · CVSS 8.9 · Analyzed
Published: 2026-04-21 · Updated: 2026-10-26 · Source: NVD
Stored catalog record
Source record retrieved 2026-10-28T10:19:30.385691+00:00. Scheduled imports handle updates; this page does not assert that the provider was queried just now.
Vulnerability overview
A server-side request forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed an attacker to extract sensitive environment variables from the instance through a timing side-channel attack against the notebook rendering service. When private mode was disabled, the notebook viewer followed HTTP redirects without revalidating the destination host, enabling an unauthenticated SSRF to internal services. By chaining this with regex filter queries against an internal API and measuring response time differences, an attacker could infer secret values character by character. Exploitation required that private mode be disabled and that the attacker be able to chain the instance's open redirect endpoint through an external redirect to reach internal services. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.14.26, 3.15.21, 3.16.17, 3.17.14, 3.18.8, 3.19.5, and 3.20.1. This vulnerability was reported via the GitHub Bug Bounty program.
Patch review priority
Assess exposure and vendor guidance
- No higher-priority signal is available in the current stored evidence.
FIRST EPSS: 0.42% · percentile 36.5 · score date 2026-10-27.
EPSS estimates probability of exploitation in the next 30 days. It does not measure your exposure or prove exploitation. The elevated threshold is 10%; CISA KEV takes precedence. About FIRST EPSS ↗
Severity and scoring
- CVSS score
- 8.9 · HIGH
- CVSS version
- 4.0
- CVSS vector
- CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/E:P/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
- Weaknesses
- CWE-918
CVSS measures technical severity; it does not establish whether this vulnerability is being exploited in your environment.
Known exploitation and remediation
Not listed in the CISA catalog retrieved for this record. This does not establish that exploitation has not occurred.
Verify affected versions and patch availability in the vendor advisory before making changes.
Affected products and versions
cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*
Before (exclusive): 3.14.26
cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*
From (inclusive): 3.15.0
Before (exclusive): 3.15.21
cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*
From (inclusive): 3.16.0
Before (exclusive): 3.16.17
cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*
From (inclusive): 3.17.0
Before (exclusive): 3.17.14
cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*
From (inclusive): 3.18.0
Before (exclusive): 3.18.8
cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*
From (inclusive): 3.19.0
Before (exclusive): 3.19.5
cpe:2.3:a:github:enterprise_server:3.20.0:*:*:*:*:*:*:*
These are NVD CPE applicability entries. Some products depend on configuration conditions; consult the official record to confirm applicability.
Advisories and references
- https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.26
Release Notes · Vendor Advisory
- https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.21
Release Notes · Vendor Advisory
- https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.17
Release Notes · Vendor Advisory
- https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.14
Release Notes · Vendor Advisory
- https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.8
Release Notes · Vendor Advisory
- https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.5
Release Notes · Vendor Advisory
- https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.1
Release Notes · Vendor Advisory