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CVE-2026-77987— GitHub Enterprise Server notebook viewer vulnerable to Server-side request forgery

一分钟漏洞结论

影响对象
GitHub Enterprise Server
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

A server-side request forgery (SSRF) vulnerability was identified in the notebook viewer of GitHub Enterprise Server. The notebook viewer validated the scheme and host of a user-supplied URL but did not validate the port, allowing requests to be directed to in

CVSS 9.3 · Critical
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一、 漏洞 CVE-2026-77987 基础信息

漏洞信息

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Vulnerability Title
GitHub Enterprise Server notebook viewer vulnerable to Server-side request forgery
来源: CVE Program / CVE List V5
Vulnerability Description
A server-side request forgery (SSRF) vulnerability was identified in the notebook viewer of GitHub Enterprise Server. The notebook viewer validated the scheme and host of a user-supplied URL but did not validate the port, allowing requests to be directed to internal services listening on other ports of the same appliance. Response bodies were not returned to the requester, but response timing acted as an oracle that allowed instance secrets to be extracted character by character. An extracted secret could then be used in a separate interaction with an internal service to obtain remote code execution on the appliance. Exploitation required network access to the instance and was unauthenticated when private mode was disabled, or required any authenticated user when private mode was enabled. This vulnerability affected GitHub Enterprise Server versions 3.17 through 3.22 and was fixed in versions 3.22.1, 3.21.6, 3.20.8, 3.19.12, 3.18.15, and 3.17.21. This vulnerability was reported through the GitHub Bug Bounty program.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
来源: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
来源: CVE Program / CVE List V5

受影响产品

厂商 产品 影响版本 CPE 订阅
GitHub Enterprise Server 3.17.0 ~ 3.17.* -

二、漏洞 CVE-2026-77987 的公开POC

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三、漏洞 CVE-2026-77987 的情报信息

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CVE-2026-77987 其他参考 (6)

同批安全公告 · GitHub · 2026-09-22 · 共 3 条

CVE-2026-77912 7.4 HIGH Stored cross-site scripting vulnerability in GitHub Enterprise Server allowed HTML attribu
CVE-2026-75101 6.0 MEDIUM Authorization bypass vulnerability in GitHub Enterprise Server allowed reading of private

IV. Related Vulnerabilities

Same product: Enterprise Server
Same vendor: GitHub
Same weakness: CWE-918

V. Comments for CVE-2026-77987

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