CVE-2026-54735 json
prebid-server's request forgery vulnerability allows for possible host environment data extraction
published 2026-07-29 3 mo ago modified 2026-10-23 16 d ago also GHSA-4p3g-4hcj-wpvx , GO-2026-6139 , EUVD-2026-50401
- cvss
- 10.0
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 49%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- go github.com/prebid/prebid-server/v4 4.4.0
- prebid prebid_server 4.4.0
- govulncheck-vulndb SLES for SAP applications 16.0, SLES 16.0 0.0.20260827T195228-160000.1.1
suse advisories SUSE-SU-2026:23625-1
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260827T195228-160000.1.1
opensuse advisories openSUSE-SU-2026:21761-1
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 3 mo ago
Exploit prediction
0.61% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| GitHub | 3.1 | 10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/prebid/prebid-server/v4 | <4.4.0 |
4.4.0 |
| go | github.com/prebid/prebid-server/v3 | <=3.30.0 |
no fix listed |
| go | github.com/prebid/prebid-server/v2 | <=2.32.0 |
no fix listed |
| go | github.com/prebid/prebid-server | <=0.275.0 |
no fix listed |
Affected products
- prebid prebid-server
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
-
github.com
/prebid/prebid-server/pull/4802
web, issue-tracking, patch
-
github.com
/prebid/prebid-server/commit/494ac271cd4b5024df9123ef25ca3cff96390be3
web, patch
-
github.com
/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx
web, patch, vendor-advisory, advisory
-
github.com
/prebid/prebid-server/releases/tag/v4.4.0
web, product, release-notes
-
github.com
/prebid/prebid-server
package
Sources
- CVE List CVE-2026-54735
- GitHub Advisory GHSA-4p3g-4hcj-wpvx
- NVD CVE-2026-54735
- OSV GO-2026-6139
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.