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CVE-2026-54735

Prebid Server server-side request forgery (SSRF)

10.0 CRITICALEPSS 0.61%
  1. Published29 Jul 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

Prebid Server< 4.4.0

Remediation

Fixed in
Prebid Server≥ 4.4.0

References

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Frequently asked

Is CVE-2026-54735 being actively exploited?

CVE-2026-54735 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.61%.

How severe is CVE-2026-54735?

CVE-2026-54735 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 0.61% probability of exploitation.

Which products are affected by CVE-2026-54735?

Affected products include Prebid Server.

How do I fix CVE-2026-54735?

Upgrade affected software to a fixed version, for example Prebid Server 4.4.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-54735 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.