CVE-2026-54734CWE-918ssrf

CVE-2026-54734

Critical · published September 18, 2026

CVSS v3.1
10.0
EPSS
1%
Percentile
49.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
10.0 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00621 · 49.1th percentile
Weakness
CWE-918 · Server-Side Request Forgery (SSRF)
Published
2026-09-18T02:17Z
References (5)
https://github.com/prebid/prebid-server-java/commit/a129a685b6fc54441c1a779ce29ea4ec20c2e09f · [email protected]https://github.com/prebid/prebid-server-java/commit/d0c723ce36aa09712c825ea9625d978f45d29a1c · [email protected]https://github.com/prebid/prebid-server-java/pull/4522 · [email protected]https://github.com/prebid/prebid-server-java/releases/tag/3.43.0 · [email protected]https://github.com/prebid/prebid-server-java/security/advisories/GHSA-fr2c-g2f8-qchg · [email protected]
EPSS history
Timeline
  • 19 SEP 03:53Z
    EPSS moved — → 0%
    epss
  • 17 SEP 21:59Z
    Prebid Server Java: Vulnerability to request forgery allows for possible host environment data extraction
    cvelistv5