10

CVE-2026-54734: prebid prebid-server-java Server-Side Request Forgery (SSRF)

CVSS: 10.0v3.1CriticalAwaiting analysis
Published 17-09-2026Last modified 18-09-2026
Open JSON

Vulnerability summary

CVE-2026-54734 is a critical (CVSS 10.0) Server-Side Request Forgery (SSRF) vulnerability in prebid prebid-server-java. EPSS estimates a 0.62% chance of exploitation in the next 30 days, higher than 49% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
10.0/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.62%
0%100%
Low · +0.26 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 17-09-2026
    PublishedVulnerability first disclosed.
  2. 18-09-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.62%

Chance of exploitation in the next 30 days

Percentile

49%

Versus all other CVEs

30-day change

+0.26 pp

From 0.36% on 22-09-2026

22-09-202622-10-2026
EPSS score
0.62%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Prebid1 product

1 vendor · 1 product

References

5 links