Coder vulnerable to post-auth URL redirection to untrusted site ('Open Redirect')

### Summary An issue on Coder's login page allows attackers to craft a Coder URL that when clicked by a logged in user could redirect them to a website the attacker controls, e.g. https://google.com. ### Details On the login page, Coder checks for the presence of a `redirect` query parameter. On successful login, the user would be redirected to the location of the parameter. Improper sanitization allows attackers to specify a URL outside of the Coder application to redirect users to. ### Impact Coder users could potentially be redirected to a untrusted website if tricked into clicking a URL crafted by the attacker. Coder authentication tokens are **not** leaked to the resulting website. To check if your deployment is vulnerable, visit the following URL for your Coder deployment: - `https://<coder url>/login?redirect=https%3A%2F%2Fcoder.com%2Fdocs` ### Patched Versions This vulnerability is remedied in - v2.16.1 - v2.15.3 - v2.14.4 All versions prior to 2.3.1 are not affected. ### Thanks - https://github.com/jchristov ### References https://github.com/coder/coder/security/advisories/GHSA-wcx9-ccpj-hx3c https://github.com/coder/coder/commit/69c1d981e3131e50d52b01f6a360abadaad699e6

Source published

28 Oct 2024 18:31:57 UTC

Source modified

18 Oct 2026 10:55:48 UTC

Observed here

24 Oct 2026 13:19:41 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

CVSS_V4 · CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Publisher rating · MODERATE