CVE-2026-27192 (GCVE-0-2026-27192)

Vulnerability from cvelistv5 – Published: 2026-02-21 03:50 – Updated: 2026-02-21 03:50
VLAI?
Title
Feathers has an origin validation bypass via prefix matching
Summary
Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. In versions 5.0.39 and below, origin validation uses startsWith() for comparison, allowing attackers to bypass the check by registering a domain that shares a common prefix with an allowed origin.The getAllowedOrigin() function checks if the Referer header starts with any allowed origin, and this comparison is insufficient as it only validates the prefix. This is exploitable when the origins array is configured and an attacker registers a domain starting with an allowed origin string (e.g., https://target.com.attacker.com bypasses https://target.com). On its own, tokens are still redirected to a configured origin. However, in specific scenarios an attacker can initiate the OAuth flow from an unauthorized origin and exfiltrate tokens, achieving full account takeover. This issue has bee fixed in version 5.0.40.
Severity ?
7.6 (High)
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CWE
  • CWE-346 - Origin Validation Error
Assigner
References
Impacted products
Vendor Product Version
feathersjs feathers Affected: < 5.0.40
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          "product": "feathers",
          "vendor": "feathersjs",
          "versions": [
            {
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        }
      ],
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            "version": "4.0",
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            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH"
          }
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          "descriptions": [
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              "description": "CWE-346: Origin Validation Error",
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      "providerMetadata": {
        "dateUpdated": "2026-02-21T03:50:35.954Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
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          "tags": [
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          "url": "https://github.com/feathersjs/feathers/commit/ee19a0ae9bc2ebf23b1fe598a1f7361981b65401"
        },
        {
          "name": "https://github.com/feathersjs/feathers/releases/tag/v5.0.40",
          "tags": [
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          "url": "https://github.com/feathersjs/feathers/releases/tag/v5.0.40"
        }
      ],
      "source": {
        "advisory": "GHSA-mp4x-c34x-wv3x",
        "discovery": "UNKNOWN"
      },
      "title": "Feathers has an origin validation bypass via prefix matching"
    }
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  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-27192",
    "datePublished": "2026-02-21T03:50:35.954Z",
    "dateReserved": "2026-02-18T19:47:02.154Z",
    "dateUpdated": "2026-02-21T03:50:35.954Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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