The Olivier Poitrey Go CORS handler through 1.3.0 actively converts a wildcard CORS…
Priority LOW 28CWE-346Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA and GitHub. Impact type from CWE-346.
Summary
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.
Why it matters now
EPSS 0.00717 54th percentileScored 2026-11-07
Fix Fixed github.com/gofiber/fiber/v2 (Go): 2.43.0github.com/rs/cors (Go): 1.5.0
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | github.com/gofiber/fiber/v2 (Go) | 2.0.0 to before 2.43.0 | 2.43.0 | Patch available | GHSA-927h-x4qj-r242 |
| — | github.com/rs/cors (Go) | before 1.5.0 | 1.5.0 | Patch available | GHSA-927h-x4qj-r242 |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- github.com/gofiber/fiber/v2 (Go) Vendor— Affected 2.0.0 to before 2.43.0 Fixed in 2.43.0 Patch available GHSA-927h-x4qj-r242
- github.com/rs/cors (Go) Vendor— Affected before 1.5.0 Fixed in 1.5.0 Patch available GHSA-927h-x4qj-r242
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:go_cors_project:go_cors:*:*:*:*:*:*:*:* | up to 1.3.0 | Vulnerable | Go Cors Project |
- cpe:2.3:a:go_cors_project:go_cors:*:*:*:*:*:*:*:* Versions up to 1.3.0 Vulnerable ·Go Cors Project
Remediation
- Fix · GHSA-927h-x4qj-r242 github.com/gofiber/fiber/v2 (Go) Fixed in 2.43.0 Advisory →
- Fix · GHSA-927h-x4qj-r242 github.com/rs/cors (Go) Fixed in 1.5.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2018-20744
- 2026-10-03 Alias added: GHSA-927h-x4qj-r242
References
Advisory 3
Sources
- CVE-2018-20744 · CVE Program
- CVE-2018-20744 · NVD
- FIRST EPSS
- GHSA-927h-x4qj-r242 · GitHub Advisory Database · CC BY 4.0
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