CVE-2026-46391 — Vulnerability in @haxtheweb/open-apis — CVE Details

### Summary Multiple functions conduct substring-only matching to validate hostnames to which basic authorization should be sent. An attacker can append the matched substrings to an attacker-controlled endpoint and capture authentication. ### Details [api/services/website/cacheAddress.js](https://github.com/haxtheweb/open-apis/blob/ff694ce91442c39ae1a78dc21e9ce50546aa207a/api/services/website/cacheAddress.js#L21), [api/apps/haxcms/lib/JOSHelpers.js](https://github.com/haxtheweb/open-apis/blob/ff694ce91442c39ae1a78dc21e9ce50546aa207a/api/apps/haxcms/lib/JOSHelpers.js#L26), and [api/apps/haxcms/convert/elmslnToSite.js](https://github.com/haxtheweb/open-apis/blob/ff694ce91442c39ae1a78dc21e9ce50546aa207a/api/apps/haxcms/convert/elmslnToSite.js#L37) use similar logic to check for hard-coded site names. However, the logic only looks for the substring to be included in the user-controlled string, allowing an attacker to craft an API call and extract the credentials intended for the hard-coded domains. ### PoC Making API calls to an affected endpoint will result in credential theft. The attacker-controlled domains in these proofs of concept are `cloudflared` tunnels, protecting the production credentials from unencrypted exposure. cacheAddress.js: <img width="3404" height="1656" alt="ssrf_cred_theft" src="https://github.com/user-attachments/assets/0a87cef5-3c4d-450a-8bb7-35123d5f621b" /> elmslnToSite.js: <img width="3409" height="1641" alt="theft2" src="https://github.com/user-attachments/assets/bede82cc-a613-4fc7-bbf6-76166af784f5" /> JOSHelpers.js: <img width="3407" height="1597" alt="theft3" src="https://github.com/user-attachments/assets/4f3f8bee-443e-4b22-9d41-eb9726619d36" /> ### Impact This vulnerability allows internal data, including secrets, to be exfiltrated to an attacker-controlled domain. Credentials were confirmed with the maintainer to grant access to unreleased LMS content on subsequent systems; out of scope for PoC.