EUVD-2026-82581Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Network-reachable unauthenticated SSRF via bid-request params (AV:N/AC:L/PR:N/UI:N); scope changes as requests hit other systems (S:C); confidentiality-centric (C:H), limited request-forging integrity (I:L), no availability impact.
Primary rating from Vendor (github).
CVSS VectorVendor: github
Lifecycle Timeline
4DescriptionCVE.org
Prebid Server Java is the Java version of Prebid Server. Prior to 3.43.0, certain bidder adapters interpolate user-supplied parameters into outbound request URLs without using HttpUtil to validate the resulting domain or path segment. A malicious actor who can supply bid-request parameters can cause the server to send HTTP requests to unintended destinations, potentially reaching internal network services, metadata endpoints, or other sensitive server endpoints with the server's network access. This issue is fixed in version 3.43.0.
Articles & Coverage 1
AnalysisAI
Server-side request forgery in Prebid Server Java before 3.43.0 allows unauthenticated remote attackers to redirect the server's outbound bidder traffic to arbitrary destinations by injecting values into bidder adapter parameters. Multiple adapters - including acuityads, adhese, adtonos, adview, axonix, bidmachine, blis, clydo, contxtful, elementaltv, and eplanning - interpolate user-supplied imp.ext fields (host, path, sellerId, accountId, supplierId, supplyId, partnerId, customerId, adunit) directly into endpoint URL templates without calling HttpUtil to validate the resulting domain or path segment, so a crafted bid request can make the server reach internal network services, cloud metadata endpoints such as 169.254.169.254, or other sensitive endpoints using its own network position. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that at least one of the affected bidder adapters (acuityads, adhese, adtonos, adview, axonix, bidmachine, blis, clydo, contxtful, elementaltv, eplanning) be enabled/configured on the Prebid Server Java instance and that the attacker can influence the corresponding imp.ext parameters in a bid request (adapter-specific fields such as host, path, sellerId, accountId, supplierId, supplyId, partnerId, customerId, or adunit). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS of 10.0 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H) is inflated for what the description and source-code evidence establish as a classic Server-Side Request Forgery (CWE-918). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade Prebid Server Java to version 3.43.0, which applies HttpUtil.validateDomainName and HttpUtil.validatePathSegment to the interpolated host, path, and identifier macros across the affected adapters (see https://github.com/prebid/prebid-server-java/releases/tag/3.43.0, PR https://github.com/prebid/prebid-server-java/pull/4522, and advisory https://github.com/prebid/prebid-server-java/security/advisories/GHSA-fr2c-g2f8-qchg). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory every Prebid Server Java deployment and confirm its version, treat any instance below 3.43.0 as exposed, and immediately enforce network egress controls so the service cannot reach RFC1918 ranges, the link-local metadata address 169.254.169.254, or other internal management endpoints, enforcing IMDSv2 and least-privilege instance roles where cloud-hosted; disable or remove the affected bidder adapters (acuityads, adhese, adtonos, adview, axonix, bidmachine, blis, clydo, contxtful, elementaltv, eplanning) if they are not business-critical, and enable alerting on outbound requests to internal destinations. …
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External POC / Exploit Code
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