Fiber: CORS wildcard origins matched without a dot boundary, allowing credentialed cross-origin reads

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-119285
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-29 22:17:01 UTC
Updated2026-10-30 19:37:07 UTC
DescriptionFiber is an Express inspired web framework written in Go. From 2.52.1 until 2.52.3, the CORS middleware's validateDomain wildcard matcher in middleware/cors/utils.go strips the scheme and checks only a host suffix without requiring a dot boundary. An application configured with a wildcard-subdomain AllowOrigins value and AllowCredentials enabled can reflect an unrelated attacker-controlled origin whose host merely ends with the configured base domain. A user who visits that origin can expose authenticated cross-origin responses to the attacker's page; empty-label origins and later comma-space parsing hardening are outside this advisory. This issue is fixed in version 2.52.3.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N

Problem Types: CWE-346 | CWE-942 | CWE-346 CWE-346: Origin Validation Error | CWE-942 CWE-942: Permissive Cross-domain Policy with Untrusted Domains

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N
3.1CNADECLARED5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Gofiber Fiber affected >= 2.52.1, < 2.52.3 Not specified

References

ReferenceSourceLinkTags
github.com/gofiber/fiber/commit/1aac6f618b6bd3e159d2449acb4232a2170b976b [email protected] github.com
github.com/gofiber/fiber/releases/tag/v2.52.3 [email protected] github.com
github.com/gofiber/fiber/pull/2915 [email protected] github.com
github.com/gofiber/fiber/security/advisories/GHSA-g5jq-qmqr-qrwf [email protected] github.com
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