jub0bs/fcors · Security
Some CORS middleware allow untrusted origins
- GHSA ID
- GHSA-v84h-653v-4pq9
- Severity
- critical
- Published
- Updated
- CVSS
- 9.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
- CVSS v3
- 9.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Description
Impact
Some CORS middleware (more specifically those created by specifying two or more origin patterns whose hosts share a proper suffix) incorrectly allow some untrusted origins, thereby opening the door to cross-origin attacks from the untrusted origins in question.
For example, specifying origin patterns https://foo.com and https://bar.com (in that order) would yield a middleware that would incorrectly allow untrusted origin https://barfoo.com.
Patches
Patched in v0.9.0.
Workarounds
None.