VulnSocial

CVE-2026-8034Disclosure(github / enterprise_server)

LOWCVSS 9.8 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD 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.

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0.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-436CWE-918

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • enterprise_server

Threat summary

  • 3 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Technical details provided in 3 signals
  • Disclosure: 3 classified signals
  • Peaked 1d ago at 2 mentions (2026-05-08); latest day: 1
  • 3 total mentions across 2 days

Affected systems

Vendors
github
Products
enterprise_server

Deep dive

Activity timeline3 mentions / 2d
01122Mentions · 2026-05-08: 2Mentions · 2026-05-10: 1Technical Details · 2026-05-08: 2Technical Details · 2026-05-10: 105-0805-10
Signal classification1 categories
Disclosure
3100.0%
Referenced assets2 URLs
Classification over time
DateTotalLabels
2026-05-082
Disclosure2
2026-05-101
Disclosure1
Full discourse3 posts
  • Upwind Security MDR@UpwindMDR
    Disclosure

    🚨 GitHub Enterprise Server SSRF: CVE-2026-8034 A high-severity SSRF vulnerability in the GitHub Enterprise Server notebook viewer could allow attackers to access internal services via URL parser confusion. #GitHub #SSRF #CVE #CyberSecurity

    Post summary

    The tweet announces a high‑severity SSRF vulnerability (CVE‑2026‑8034) in GitHub Enterprise Server’s notebook viewer, but provides neither exploit code nor mitigation details.

    0002098
    168 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-8034 A server-side request forgery (SSRF) vulnerability was identified in the GitHub Enterprise Server notebook viewer that allowed an attacker to access internal services b… https://www.cve.org/CVERecord?id=CVE-2026-8034

    Post summary

    The text announces a new SSRF vulnerability (CVE-2026-8034) in GitHub Enterprise Server's notebook viewer that can expose internal services, but it does not provide any PoC, exploit code, or patch information.

    00010210
    57.5K followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    Disclosure

    CVE-2026-8034 Server-Side Request Forgery in GitHub Enterprise Server Notebook Viewer Before 3.21 https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-8034

    Post summary

    The post references CVE‑2026‑8034, a Server‑Side Request Forgery vulnerability affecting GitHub Enterprise Server Notebook Viewer before version 3.21, but provides no PoC, exploit, active exploitation, or patch details.

    0000064
    4.0K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appgithubenterprise_server---

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