CVE-2018-20744
github.com/gofiber/fiber/v2 vulnerable to Origin Validation Error
The Olivier Poitrey Go CORS handler through 1.3.0 actively converts a wildcard CORS policy into reflecting an arbitrary Origin header value, which is incompatible with the CORS security design, and could lead to CORS misconfiguration security problems.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
The Olivier Poitrey Go CORS handler through 1.3.0 actively converts a wildcard CORS policy into reflecting an arbitrary Origin header value, which is incompatible with the CORS security design, and could lead to CORS misconfiguration security problems.
- Record
CVE-2018-20744- CVSS 3.0
- 5.9 Medium
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-346
- Updated
- 2026-11-02
CVE List No score
The Olivier Poitrey Go CORS handler through 1.3.0 actively converts a wildcard CORS policy into reflecting an arbitrary Origin header value, which is incompatible with the CORS security design, and could lead to CORS misconfiguration security problems.
- Record
CVE-2018-20744- Updated
- 2026-11-02
EUVDEUVD-2022-3267 No score
The Olivier Poitrey Go CORS handler through 1.3.0 actively converts a wildcard CORS policy into reflecting an arbitrary Origin header value, which is incompatible with the CORS security design, and could lead to CORS misconfiguration security problems.
- Record
EUVD-2022-3267- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-927h-x4qj-r242
github.com/gofiber/fiber/v2 vulnerable to Origin Validation Error
The Olivier Poitrey Go CORS handler through 1.3.0 actively converts a wildcard CORS policy into reflecting an arbitrary Origin header value, which is incompatible with the CORS security design, and could lead to CORS misconfiguration security problems.
- Record
GHSA-927h-x4qj-r242- CVSS 3.0
- 5.9 Medium
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-346
- Updated
- 2026-11-02
OSV
The Olivier Poitrey Go CORS handler through 1.3.0 actively converts a wildcard CORS policy into reflecting an arbitrary Origin header value, which is incompatible with the CORS security design, and could lead to CORS misconfiguration security problems.
- Record
CVE-2018-20744- CVSS 3.0
- 5.9 Medium
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
OSVGHSA-927h-x4qj-r242
github.com/gofiber/fiber/v2 vulnerable to Origin Validation Error
The Olivier Poitrey Go CORS handler through 1.3.0 actively converts a wildcard CORS policy into reflecting an arbitrary Origin header value, which is incompatible with the CORS security design, and could lead to CORS misconfiguration security problems.
- Record
GHSA-927h-x4qj-r242- CVSS 3.0
- 5.9 Medium
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-346
- Updated
- 2026-11-02
OSVGO-2023-1792 No score
Insecure wildcard CORS policy in github.com/rs/cors
The CORS handler actively converts a wildcard CORS policy into reflecting an arbitrary Origin header value, which is incompatible with the CORS security design, and could lead to CORS misconfiguration security problems.
- Record
GO-2023-1792- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
github.com/gofiber/fiber/v2Go |
2.0.0 up to 2.43.0 | 2.43.0 |
github.com/rs/corsGo |
before 1.5.0 | 1.5.0 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2018-20744 is a medium vulnerability (CVSS 5.9) in Go Cors Project Cors, published January 28, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.72%, the 53rd percentile. Fixed in github.com/gofiber/fiber/v2 2.43.0.