CVE-2026-27192: high-severity vulnerability in feathersjs feathers
Feathers has an origin validation bypass via prefix matching
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.6epss 0.3%
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.
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
Affected products
feathersjs · feathersRelated CVEs — feathersjs feathers
In the same product, most dangerous first.
CVE-2023-37899HIGHfeathersjs socket handler allows abusing implicit toStringEPSS 1.2%CVE-2026-29792CRITICALFeathersjs has an OAuth Callback Account TakeoverEPSS 0.6%CVE-2026-27193HIGHFeathers exposes internal headers via unencrypted session cookieEPSS 0.4%CVE-2026-54335LOWFeathersjs: Prototype pollution in @feathersjs/commons _.merge via JSON-parsed __proto__EPSS 0.4%CVE-2026-27191HIGHFeathers: Open Redirect in OAuth callback enables account takeoverEPSS 0.3%