Dashboard / CVE-2026-8034

CVE-2026-8034

HIGH
MEDIUM Priority: 0.04 BB Relevance: 76/100
Published: 2026-05-07 Modified: 2026-10-26 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: X
AT: None
VC: None
VI: None
VA: None

Description

A server-side request forgery (SSRF) vulnerability was identified in the GitHub Enterprise Server notebook viewer that allowed an attacker to access internal services by exploiting URL parser confusion between the validation layer and the HTTP request library. The hostname validation used a different URL parser than the request library, enabling a crafted URL to pass validation while directing the request to an unintended host. Exploitation required network access to the GitHub Enterprise Server instance. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.16.18, 3.17.15, 3.18.9, 3.19.6, and 3.20.2. This vulnerability was reported via the GitHub Bug Bounty program.

Weakness Classification (2)

Affected Software (5)

VendorProductVersion
github enterprise_server < 3.16.18
github enterprise_server 3.17.0 – 3.17.15
github enterprise_server 3.18.0 – 3.18.9
github enterprise_server 3.19.0 – 3.19.6
github enterprise_server 3.20.0 – 3.20.2

References & Advisories (5)

Bug Bounty Relevance

76 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

7.9 / 10.0 v4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H/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

EPSS — Exploitation Probability

0.52%
Raw Score 0.005200
Percentile 44.1%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00520
2026-10-28
0.00520

Intelligence Sources

nvd ref →

External Links