CVE-2026-54735SSRF in Prebid Server allows access to internal services
Prebid Server is an open-source solution for running real-time advertising auctions in the cloud. Prior to version 4.4.0, certain bidder adapters in Prebid Server interpolate user-supplied parameters into outbound request URLs without properly validating host and subdomain values, allowing crafted bid request parameters to cause server-side requests to unintended destinations and potentially expose internal network services or sensitive server endpoints. This issue is fixed in version 4.4.0.
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Prebid Server es vulnerable a ataques de falsificación de solicitudes del lado del servidor (SSRF) debido a una validación insuficiente en los parámetros de los adaptadores de postores. Un atacante puede manipular estos parámetros para forzar al servidor a realizar peticiones a destinos no deseados, exponiendo potencialmente servicios internos o endpoints sensibles en tu red privada. Se recomienda actualizar a la versión 4.4.0 para corregir esta vulnerabilidad de severidad crítica.
Relevant roles
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HCWE-918EPSS
No EPSS score yet (CVE may be too fresh).
Technical description
Prebid Server is an open-source solution for running real-time advertising auctions in the cloud. Prior to version 4.4.0, certain bidder adapters in Prebid Server interpolate user-supplied parameters into outbound request URLs without properly validating host and subdomain values, allowing crafted bid request parameters to cause server-side requests to unintended destinations and potentially expose internal network services or sensitive server endpoints. This issue is fixed in version 4.4.0.