CVE-2026-54734

CRITICALPre-NVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 10.0 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 70% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 10.0Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
10.0
EG Score
10.0(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity100% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
30%
KEV
Not listed

Published

September 17, 2026

Last Modified

September 18, 2026

Advisory Details (5)

Auto-updated Sep 18, 2026
Patch available. Sources: github_release, github, github_commit, github_pr.
github Patch Available

Vulnerability to request forgery allows for possible host environment data extraction · Advisory · prebid/prebid-server-java · GitHub

Affected: 3.43.0 (

https://github.com/prebid/prebid-server-java/security/advisories/GHSA-fr2c-g2f8-qchg
github_release Patch Available

v3.43.0

Patch available: prebid/prebid-server-java 3.43.0

https://github.com/prebid/prebid-server-java/releases/tag/3.43.0
github_pr Patch Available

Validate url domain and path

Patch available: prebid/prebid-server-java 3.43.0 (PR #4522 merged 2026-05-29)

https://github.com/prebid/prebid-server-java/pull/4522
github_commit Patch Available

commit d0c723ce36aa (prebid/prebid-server-java)

Patch available: prebid/prebid-server-java 3.43.0 (contains commit d0c723ce36aa)

https://github.com/prebid/prebid-server-java/commit/d0c723ce36aa09712c825ea9625d978f45d29a1c
github_commit

commit a129a685b6fc (prebid/prebid-server-java)

Fix landed in prebid/prebid-server-java commit a129a685b6fc — awaiting tagged release

https://github.com/prebid/prebid-server-java/commit/a129a685b6fc54441c1a779ce29ea4ec20c2e09f

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 9× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-20 20:34 UTCEG score recompute
  2. 2026-09-20 20:16 UTCEPSS rescore
  3. 2026-09-19 18:22 UTCEG score recompute
  4. 2026-09-18 20:33 UTCEG score recompute
  5. 2026-09-18 20:10 UTCEG score recompute
  6. 2026-09-18 19:28 UTCEPSS rescore
  7. 2026-09-17 22:23 UTCEG score recompute
  8. 2026-09-17 22:09 UTCEG score recompute
  9. 2026-09-17 22:09 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-54734?
CVE-2026-54734 is a critical vulnerability published on September 17, 2026. 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…
When was CVE-2026-54734 disclosed?
CVE-2026-54734 was first published in the National Vulnerability Database on September 17, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54734 actively exploited?
CVE-2026-54734 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 69.9% of all scored CVEs.
What is the CVSS score of CVE-2026-54734?
CVE-2026-54734 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-54734?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54734, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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