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[TLP:CLEAR] GitHub Enterprise Server fixes 2 vulnerabilities

With versions 3.14.19, 3.15.14, 3.16.10, 3.17.7 and 3.18.1, GitHub fixes 2 vulnerabilities in GitHub Enterprise Server [1][2].

GitHub Enterprise Server - XSS (CVE-2025-11892)
CVSS 8.6 (High)

An unauthenticated remote attacker can carry out a reflected XSS attack using social engineering [1].

The vulnerability is present in product:

  • GitHub Enterprise Server; >=3.14, <3.14.19; >=3.15, <3.15.14; >=3.16, <3.16.10; >=3.17, <3.17.7; >=3.18, <3.18.1;

CVSS: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/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

More information:

  • CVE-2025-11892 at cve.org, NVD
  • CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') at cwe.mitre.org

The vulnerability was publicly disclosed 10. 11. 2025.

GitHub Enterprise Server - symlink escape (CVE-2025-11578)
CVSS 7.5 (High)

An authenticated remote attacker with "Enterprise admin" privileges can gain SSH access to the affected instance by carrying out a symlink attack [2].

The vulnerability is present in product:

  • GitHub Enterprise Server; >=3.14, <3.14.19; >=3.15, <3.15.14; >=3.16, <3.16.10; >=3.17, <3.17.7; >=3.18, <3.18.1;

CVSS: CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/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

More information:

The vulnerability was publicly disclosed 10. 11. 2025.

By CESNET, z.s.p.o. Martin Krajči on 21. 11. 2025.

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