CVE-2026-92781

MEDIUMPre-NVD 6.36.3—
EchelonGraph scoreHIGH confidence

Score 6.3 from GitHub Security Advisory published 2026-09-16. a secondary CVSS source baseline 6.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
6.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.3Exploit: None knownExposed: 0

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

Builder.io Gen2 SDKs through versions 5.2.11 and 0.25.13 contain a prototype pollution vulnerability in the unflatten helper that processes builder.userAttributes query parameters without prototype guards. Attackers can craft preview links with __proto__ or prototype segments to pollute Object.prototype in a visitor's browser when the SDK processes the malicious URL.

CVSS v3
6.3
EG Score
6.3(high)
EG Risk
33(Track)
EG Risk 33/100SSVC: 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
Severity63% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
18%
KEV
Not listed

Published

September 16, 2026

Last Modified

September 16, 2026

Advisory Details (5)

Auto-updated Sep 16, 2026
No patch confirmed yet.
generic

Builder.io Gen2 SDKs through 5.2.11 Prototype Pollution via builder.userAttributes | Advisories | VulnCheck

https://www.vulncheck.com/advisories/builder-io-gen2-sdks-through-5.2.11-prototype-pollution-via-builder-userattributes
generic

builder/packages/sdks/src/helpers/flatten.ts at main · BuilderIO/builder · GitHub

https://github.com/BuilderIO/builder/blob/main/packages/sdks/src/helpers/flatten.ts#L60-L76
generic

builder/packages/sdks/src/functions/get-content/generate-content-url.ts at main · BuilderIO/builder · GitHub

https://github.com/BuilderIO/builder/blob/main/packages/sdks/src/functions/get-content/generate-content-url.ts
generic

GitHub - BuilderIO/builder: Visual Development for React, Vue, Svelte, Qwik, and more · GitHub

https://github.com/BuilderIO/builder
generic

Issue · GitHub

https://github.com/BuilderIO/builder/issues/4824

Vendor Advisories for CVE-2026-92781(1)

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

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. 2026-09-19 01:15 UTCEG score recompute
  2. 2026-09-19 01:15 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-17 23:44 UTCEG score recompute
  5. 2026-09-17 23:44 UTCGHSA enrichment
  6. 2026-09-17 19:32 UTCEPSS rescore
  7. 2026-09-16 21:24 UTCEG score recompute
  8. 2026-09-16 20:38 UTCEG score recompute
  9. 2026-09-16 20:34 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-92781?
CVE-2026-92781 is a medium vulnerability published on September 16, 2026. Builder.io Gen2 SDKs through versions 5.2.11 and 0.25.13 contain a prototype pollution vulnerability in the unflatten helper that processes builder.userAttributes query parameters without prototype guards. Attackers can craft preview links with proto or prototype segments to pollute…
When was CVE-2026-92781 disclosed?
CVE-2026-92781 was first published in the National Vulnerability Database on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-92781 actively exploited?
CVE-2026-92781 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 82.1% of all scored CVEs.
What is the CVSS score of CVE-2026-92781?
CVE-2026-92781 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-92781?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-92781, 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

Explore the affected products and dependency analysis for CVE-2026-92781

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