CVE Explorer
CVE-2026-54735
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.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"prebid-server","vendor":"prebid","versions":[{"status":"affected","version":"< 4.4.0"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:3d77bb37ca12d4ace4308c6294d762f5cdfb23440facba085861b4933ac1e17f · sha256:018411879b013c04… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":10,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:3d77bb37ca12d4ace4308c6294d762f5cdfb23440facba085861b4933ac1e17f · sha256:018411879b013c04… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-918","description":"CWE-918: Server-Side Request Forgery (SSRF)","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:3d77bb37ca12d4ace4308c6294d762f5cdfb23440facba085861b4933ac1e17f · sha256:018411879b013c04… · /containers/cna/problemTypes/0/descriptions/0
Source references
4 source assertions{"name":"https://github.com/prebid/prebid-server/commit/494ac271cd4b5024df9123ef25ca3cff96390be3","tags":["x_refsource_MISC"],"url":"https://github.com/prebid/prebid-server/commit/494ac271cd4b5024df9123ef25ca3cff96390be3"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:3d77bb37ca12d4ace4308c6294d762f5cdfb23440facba085861b4933ac1e17f · sha256:018411879b013c04… · /containers/cna/references/2
{"name":"https://github.com/prebid/prebid-server/pull/4802","tags":["x_refsource_MISC"],"url":"https://github.com/prebid/prebid-server/pull/4802"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:3d77bb37ca12d4ace4308c6294d762f5cdfb23440facba085861b4933ac1e17f · sha256:018411879b013c04… · /containers/cna/references/1
{"name":"https://github.com/prebid/prebid-server/releases/tag/v4.4.0","tags":["x_refsource_MISC"],"url":"https://github.com/prebid/prebid-server/releases/tag/v4.4.0"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:3d77bb37ca12d4ace4308c6294d762f5cdfb23440facba085861b4933ac1e17f · sha256:018411879b013c04… · /containers/cna/references/3
{"name":"https://github.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx","tags":["x_refsource_CONFIRM"],"url":"https://github.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:3d77bb37ca12d4ace4308c6294d762f5cdfb23440facba085861b4933ac1e17f · sha256:018411879b013c04… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.