CVE-2026-54734 Prebid Server Java - Server Side Request Forgery

Prebid Server Java < 3.43.0 contains a server side request forgery caused by improper validation of user-supplied parameters in outbound request URLs, letting attackers cause the server to send requests to unintended destinations, exploit requires attacker to supply bid-request parameters.

CVSS base score 10.0 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.62% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Server Side Request Forgery
Impact
Server Side Request Forgery
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Published
17 September 2026
Updated
15 October 2026
Weakness
CWE-918

Vendor fix

Update to version 3.43.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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