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CVE-2025-47269 – Code-server Proxy Pathway Token Exfiltration

The following table lists the changes that have been made to the
CVE-2025-47269 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by [email protected]

    May. 09, 2025

    Action Type Old Value New Value
    Added Description code-server runs VS Code on any machine anywhere through browser access. Prior to version 4.99.4, a maliciously crafted URL using the proxy subpath can result in the attacker gaining access to the session token. Failure to properly validate the port for a proxy request can result in proxying to an arbitrary domain. The malicious URL `https:///proxy/[email protected]/path` would be proxied to `[email protected]/path` where the attacker could exfiltrate a user’s session token. 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. This issue has been patched in version 4.99.4.
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
    Added CWE CWE-441
    Added Reference https://github.com/coder/code-server/commit/47d6d3ada5aadef6d221f3d612401eb3dad9299e
    Added Reference https://github.com/coder/code-server/releases/tag/v4.99.4
    Added Reference https://github.com/coder/code-server/security/advisories/GHSA-p483-wpfp-42cj
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