CVE-2017-20146
Usage of the CORS handler may apply improper CORS headers, allowing the requester to explicitly control the value of the Access-Control-Allow-Origin header, which bypasses the expected behavior of the Same Origin Policy.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.77%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Usage of the CORS handler may apply improper CORS headers, allowing the requester to explicitly control the value of the Access-Control-Allow-Origin header, which bypasses the expected behavior of the Same Origin Policy.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.77% probability · 55th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-346
- Affected
- gorillatoolkit/handlers
- Source
- security@golang.org
EPSS 0.8% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/gorilla/handlers/commit/90663712d74cb411cbef281bc1e08c19d1a76145Patch, Third Party Advisory
- https://github.com/gorilla/handlers/pull/116Patch, Third Party Advisory
- https://pkg.go.dev/vuln/GO-2020-0020Third Party Advisory
- https://github.com/gorilla/handlers/commit/90663712d74cb411cbef281bc1e08c19d1a76145Patch, Third Party Advisory
- https://github.com/gorilla/handlers/pull/116Patch, Third Party Advisory
- https://pkg.go.dev/vuln/GO-2020-0020Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.