Koajs vulnerable to Cross-Site Scripting (XSS) at ctx.redirect() function
### Summary In koa < 2.16.1 and < 3.0.0-alpha.5, passing untrusted user input to ctx.redirect() even after sanitizing it, may execute javascript code on the user who use the app. ### Patches This issue is patched in 2.16.1 and 3.0.0-alpha.5. ### PoC Coming soon... ### Impact 1. Redirect user to another phishing site 2. Make request to another endpoint of the application based on user's cookie 3. Steal user's cookie
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2025-32379US | medium6.1 | — | ||
Koa is expressive middleware for Node.js using ES2017 async functions. In koa < 2.16.1 and < 3.0.0-alpha.5, passing untrusted user input to ctx.redirect() even after sanitizing it,… | ||||
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