CVE-2026-54735
CRITICALprebid-server's request forgery vulnerability allows for possible host environment data extraction
Title source: cnaDescription
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.
References (4)
Core 4
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx
X_Refsource_Misc x_refsource_misc
https://github.com/prebid/prebid-server/pull/4802
X_Refsource_Misc x_refsource_misc
https://github.com/prebid/prebid-server/commit/494ac271cd4b5024df9123ef25ca3cff96390be3
X_Refsource_Misc x_refsource_misc
https://github.com/prebid/prebid-server/releases/tag/v4.4.0
Scores
CVSS v3
10.0
EPSS
0.0035
EPSS Percentile
27.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
total
Details
CWE
CWE-918
Status
published
Products (5)
prebid/prebid-server
0 - 0.275.0Go
prebid/prebid-server
0 - 2.32.0Go
prebid/prebid-server
0 - 3.30.0Go
prebid/prebid-server
0 - 4.4.0Go
prebid/prebid-server
< 4.4.0
Published
Jul 29, 2026
Tracked Since
Jul 29, 2026