CVE-2026-54735

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: 0.3%, top 72% 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
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 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 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
28%
KEV
Not listed

Published

July 29, 2026

Last Modified

August 18, 2026

Advisory Details (4)

Auto-updated Sep 15, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
github Patch Available

Request forgery vulnerability allows for possible host environment data extraction · Advisory · prebid/prebid-server · GitHub

https://github.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx
github_release Patch Available

v4.4.0

Patch available: prebid/prebid-server v4.4.0

https://github.com/prebid/prebid-server/releases/tag/v4.4.0
github_pr Patch Available

Validate host & subdomain bidder params

Patch available: prebid/prebid-server v4.4.0 (PR #4802 merged 2026-06-05)

https://github.com/prebid/prebid-server/pull/4802
github_commit Patch Available

commit 494ac271cd4b (prebid/prebid-server)

Patch available: prebid/prebid-server v4.4.0 (contains commit 494ac271cd4b)

https://github.com/prebid/prebid-server/commit/494ac271cd4b5024df9123ef25ca3cff96390be3

Vendor Advisories for CVE-2026-54735(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(4 across 1 ecosystem)
Go(4)
PackageVulnerable rangeFixed inDependents
github.com/prebid/prebid-server———
github.com/prebid/prebid-server/v2———
github.com/prebid/prebid-server/v3———
github.com/prebid/prebid-server/v4—4.4.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 49× 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. 2026-09-15 07:54 UTCEG score recompute
  2. 2026-09-15 03:11 UTCEPSS rescore
  3. 2026-09-13 19:53 UTCEG score recompute
  4. 2026-09-13 16:47 UTCEPSS rescore
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  16. 2026-09-05 19:06 UTCEG score recompute
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  19. 2026-09-04 05:06 UTCEPSS rescore
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  24. 2026-08-30 21:40 UTCEG score recompute
  25. 2026-08-30 19:17 UTCEPSS rescore
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  1. 2026-08-30 03:00 UTCEG score recompute
  2. 2026-08-30 01:22 UTCEPSS rescore
  3. 2026-08-29 23:17 UTCEG score recompute
  4. 2026-08-28 21:41 UTCEPSS rescore
  5. 2026-08-27 20:55 UTCEG score recompute
  6. 2026-08-27 14:25 UTCEPSS rescore
  7. 2026-08-26 19:39 UTCEG score recompute
  8. 2026-08-26 14:46 UTCEPSS rescore
  9. 2026-08-25 17:38 UTCEG score recompute
  10. 2026-08-25 13:49 UTCEPSS rescore
  11. 2026-08-24 15:13 UTCEG score recompute
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  13. 2026-08-23 01:58 UTCEG score recompute
  14. 2026-08-23 00:19 UTCEPSS rescore
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  16. 2026-08-21 23:49 UTCEPSS rescore
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  18. 2026-08-20 22:55 UTCEPSS rescore
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  20. 2026-08-19 17:04 UTCEPSS rescore
  21. 2026-08-18 14:54 UTCEG score recompute
  22. 2026-08-18 13:48 UTCEPSS rescore
  23. 2026-08-17 16:55 UTCEG score recompute
  24. 2026-08-17 13:47 UTCEPSS rescore
  25. 2026-08-16 18:02 UTCEG score recompute
  26. 2026-08-16 14:56 UTCEPSS rescore
  27. 2026-08-16 03:11 UTCEG score recompute
  28. 2026-08-16 02:14 UTCEPSS rescore
  29. 2026-08-15 04:54 UTCEG score recompute
  30. 2026-08-15 01:30 UTCEPSS rescore
  31. 2026-08-13 23:10 UTCEG score recompute
  32. 2026-08-13 22:00 UTCEPSS rescore
  33. 2026-08-12 17:28 UTCEG score recompute
  34. 2026-08-12 13:51 UTCEPSS rescore
  35. 2026-08-11 15:29 UTCEG score recompute
  36. 2026-08-11 00:38 UTCEG score recompute
  37. 2026-08-11 00:00 UTCEPSS rescore
  38. 2026-08-09 15:10 UTCEG score recompute
  39. 2026-08-09 13:46 UTCEPSS rescore
  40. 2026-08-08 16:54 UTCEG score recompute
  41. 2026-08-08 16:37 UTCEPSS rescore
  42. 2026-08-07 18:38 UTCEG score recompute
  43. 2026-08-06 16:35 UTCEG score recompute
  44. 2026-08-06 13:47 UTCEPSS rescore
  45. 2026-08-05 22:01 UTCEG score recompute
  46. 2026-08-05 19:17 UTCEPSS rescore
  47. 2026-08-04 16:14 UTCEG score recompute
  48. 2026-08-04 15:10 UTCEPSS rescore
  49. 2026-08-04 12:32 UTCEG score recompute
  50. 2026-08-04 10:39 UTCEPSS rescore
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  53. 2026-08-02 03:59 UTCEG score recompute
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  55. 2026-08-01 05:42 UTCEG score recompute
  56. 2026-08-01 04:16 UTCEPSS rescore
  57. 2026-07-30 18:45 UTCEG score recompute
  58. 2026-07-30 16:28 UTCEPSS rescore
  59. 2026-07-30 11:08 UTCEG score recompute
  60. 2026-07-29 19:33 UTCEG score recompute
  61. 2026-07-29 18:34 UTCEG score recompute
  62. 2026-07-29 16:23 UTCEG score recompute
  63. 2026-07-29 16:07 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-54735?
CVE-2026-54735 is a critical vulnerability published on July 29, 2026. 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…
When was CVE-2026-54735 disclosed?
CVE-2026-54735 was first published in the National Vulnerability Database on July 29, 2026, with the most recent update on August 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54735 actively exploited?
CVE-2026-54735 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 72.2% of all scored CVEs.
What is the CVSS score of CVE-2026-54735?
CVE-2026-54735 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-54735?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54735, 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.

Dependency Blast Radius

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