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Critical, CVSS 10.0amended

prebid-server's request forgery vulnerability allows for possible host environment data extraction

CVE-2026-54735GHSA-4p3g-4hcj-wpvx

What to do

Partial vendor fix. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Go github.com/prebid/prebid-server

    Affected
    <= 0.275.0
    Fixed in
    no fixed version recorded

  • Go github.com/prebid/prebid-server/v2

    Affected
    <= 2.32.0
    Fixed in
    no fixed version recorded

  • Go github.com/prebid/prebid-server/v4

    Affected
    < 4.4.0
    Fixed in
    4.4.0

  • Go github.com/prebid/prebid-server/v3

    Affected
    <= 3.30.0
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
10.0 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS
  • CVE-2026-54735: 0.61% estimated exploitation activity in the next 30 days; percentile 49.33 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Impact Certain bidder adapters accept user-supplied parameters that are interpolated into outbound request URLs. Without proper input validation, a malicious actor could craft bid request parameters that cause the server to send HTTP requests to unintended destinations, potentially exposing internal network services or sensitive server endpoints to unauthorized access. Patches Patched in v4.4.0 Workarounds If one is unable to update, please make sure that the affected bidder adapters are disabled.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-4p3g-4hcj-wpvx

  2. Revision 2 · amended ·

    Amended from osv record GO-2026-6139

  3. Revision 1 · created ·

    Published from osv record GHSA-4p3g-4hcj-wpvx

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-54735

Advisory: prebid-server's request forgery vulnerability allows for possible host environment data extraction
IDs: CVE-2026-54735, GHSA-4p3g-4hcj-wpvx
Record: https://patchnext.com/advisories/cve-2026-54735 (revision 3, source checked 26 Oct 2026, 15:27 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 10.0)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Partial vendor fix; fixed versions by package: github.com/prebid/prebid-server/v4 4.4.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/prebid/prebid-server: affected <= 0.275.0
- Go github.com/prebid/prebid-server/v2: affected <= 2.32.0
- Go github.com/prebid/prebid-server/v4: affected < 4.4.0; fixed in 4.4.0
- Go github.com/prebid/prebid-server/v3: affected <= 3.30.0

## Suggested inspection (read-only)
- Go github.com/prebid/prebid-server: check the installed version with your package manager.
- Go github.com/prebid/prebid-server/v2: check the installed version with your package manager.
- Go github.com/prebid/prebid-server/v4: check the installed version with your package manager.
- Go github.com/prebid/prebid-server/v3: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/prebid/prebid-server, github.com/prebid/prebid-server/v2, github.com/prebid/prebid-server/v4, github.com/prebid/prebid-server/v3.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-4p3g-4hcj-wpvx (OSV record GHSA-4p3g-4hcj-wpvx lists affected ranges: Go github.com/prebid/prebid-server/v4 >=0 =0 =0 =0 <=0.275.0)
- Verified: https://osv.dev/vulnerability/GO-2026-6139 (OSV record GO-2026-6139 lists affected ranges: Go github.com/prebid/prebid-server/v4 >=0 <4.4.0 (fixed))
- Verified: https://github.com/advisories/GHSA-4p3g-4hcj-wpvx (GitHub-reviewed advisory GHSA-4p3g-4hcj-wpvx lists affected ranges: Go github.com/prebid/prebid-server/v4 >=0 =0 =0 =0 <=0.275.0)

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