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VulnerabilityPublished

CVE-2026-119285: gofiber fiber · Origin Validation Error

Affects gofiber fiberSource CVE Database V5

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Not known to be exploited · CVSS 5.9 Medium : upgrade to 2.52.3 when convenient.

Data as of 29 Oct 2026, 21:59 UTC

CVSS 3.1 base score
5.9Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (GitHub_M)CVSS 3.15.9
Patch
Available – fixed in 2.52.3
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 29 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade fiber and github.com/gofiber/fiber to 2.52.3.

Affected software

ProductAffectedFixed in
gofiberfiberAffected
  • >=2.52.1 <2.52.3
Fixed in
  • 2.52.3
Gogithub.com/gofiber/fiberpkg:golang/github.com/gofiber/fiberOther threatsAffected
  • >=2.52.1 <2.52.3
Fixed in
  • 2.52.3

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade Fiber to version 2.52.3 or later, where this vulnerability is fixed. No other mitigation is indicated by the vendor advisory.

Description

A vulnerability in the Fiber web framework versions 2.52.1 and 2.52.2 affects the CORS middleware's domain validation. The validateDomain wildcard matcher improperly strips the scheme and only checks for a host suffix without requiring a dot boundary. This allows an attacker-controlled origin with a host ending in the configured base domain to bypass restrictions when wildcard-subdomain AllowOrigins and AllowCredentials are enabled, potentially exposing authenticated cross-origin responses to the attacker. The issue is fixed in version 2.52.3.

References

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