Manish Gupta 8537b6edfd [INFRA-779] fix(security): reject authority-relative next_path redirects
Server: validate_next_path (apps/api/plane/utils/path_validator.py) calls
urlparse(next_path) and only extracts .path when scheme or netloc is
truthy. For "///example.com/" (three or more leading slashes), urlparse()
returns both scheme and netloc empty, so that branch never fires and the
raw string passes every remaining check unchanged. Fixed by rejecting any
next_path starting with "//" outright, right after the existing "must
start with /" check.

Client: isValidURL (apps/web/core/lib/wrappers/authentication-wrapper.tsx)
only regex-blocked a literal http(s)/ftp scheme prefix, so the same
authority-relative string passed and was handed to router.push(). Fixed
by resolving the URL against location.origin and requiring the result to
actually still be same-origin, instead of pattern-matching the input.

Browsers resolve a leading "//" as authority-relative even when neither
validator's own URL parsing detected a host — the accepted value silently
navigates off-domain post-login, a same-origin-trust phishing vector.

Checked the advisory's other listed next_path consumers (auth-form
components, oauth hooks, api.service.ts) — they only forward the value to
a server-side auth redirect or a hidden form field, no independent
client-side navigation, so they're covered by the server-side fix.

8 new server-side tests, fail-before verified. Client-side fix verified
empirically via Node's URL parser (WHATWG-compliant, matches browser
behavior) — no test harness exists for apps/web in this repo.

Co-authored-by: Plane AI <noreply@plane.so>
2026-08-28 15:59:06 +05:30



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