10

CVE-2026-54735: prebid prebid_server Server-Side Request Forgery (SSRF)

CVSS: 10.0v3.1CriticalAnalyzed
AliasesGHSA-4p3g-4hcj-wpvxGO-2026-6139
Published 29-07-2026Last modified 29-07-2026
Open JSON

Vulnerability summary

CVE-2026-54735 is a critical (CVSS 10.0) Server-Side Request Forgery (SSRF) vulnerability in prebid prebid_server. EPSS estimates a 0.61% chance of exploitation in the next 30 days, higher than 48.5% 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
0.61%
0%100%
Low · +0.27 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
OPENSUSE-SU-2026:21761-1SUSE-SU-2026:23625-1

Timeline

  1. 29-07-2026
    PublishedVulnerability first disclosed.
  2. 29-07-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.61%

Chance of exploitation in the next 30 days

Percentile

49%

Versus all other CVEs

30-day change

+0.27 pp

From 0.34% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.61%

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

Github.com/prebid/prebid-server3 products
  • v2≤ 2.32.0
  • v3≤ 3.30.0
  • v4< 4.4.0
Prebid2 products
Github.com/prebid1 product
  • prebid-server≤ 0.275.0

3 vendors · 6 products

References

5 links