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CVE-2026-54735 is a server-side request forgery vulnerability in Prebid Server affecting versions prior to 4.4.0. The flaw resides in certain bidder adapters that construct outbound bid request URLs from bidder-specific parameters supplied through the OpenRTB imp[].ext.<bidder> path. Parameters such as host, subdomain, account, zone, endpoint, or pbsHost were interpolated into URL templates using macro expansion or string concatenation without sufficient validation of host and subdomain values. As a result, crafted input could alter the intended destination of outbound HTTP requests, causing the server to connect to unintended external or internal endpoints. This can expose internal network services, sensitive server endpoints, and host-environment-accessible resources to unauthorized access.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
6 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.