Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-54673

CVE-2026-54673HIGH

electron-userland electron-builder — electron-updater: Cross-origin redirect leaks `PRIVATE-TOKEN` and mixed-case `Authorization` credentials in `builder-util-runtime`

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   L   P   H   N   N    8.2   .0041   32.7     —

AFFECTED
  Product               Versions     Fixed
  electron-builder      < 26.15.0 –  —
  builder-util-runtime  < 9.7.0 –    —

TIMELINE
  Jun 15  Reserved by GitHub_M
  Jun 30  Published (CNA: GitHub_M)
  Aug 26  EXPLOIT PUBLISHED — CVE-2026-54673 (electron-userland electron-builder). Public exploit reference added.

CWE-200 · CNA: GitHub_M · CVSS v4.0 · 2 references · NVD status: Analyzed

Description

electron-updater allows for automatic updates for Electron apps. Prior to 9.7.0, the HTTP redirect handler (HttpExecutor.prepareRedirectUrlOptions) only stripped a credential header whose key string matched exactly lowercase "authorization", exposing credentials. Other credential-bearing headers — most notably PRIVATE-TOKEN (used by GitLab's personal access token flow) and mixed-case Authorization (used by GitLab's Bearer/OAuth flow) — were not stripped and could be forwarded to an attacker-controlled cross-origin redirect destination. This issue has been fixed in version 9.7.0.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 15, 2026	Reserved	Reserved by GitHub_M
June 30, 2026	Published	Published (CNA: GitHub_M)
August 26, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-54673 (electron-userland electron-builder). Public exploit reference added.

Affected

Affected products and packages — 2 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
electron-userland	electron-builder	—	< 26.15.0	—
electron-userland	builder-util-runtime	—	< 9.7.0	—

Weaknesses

CWE-200

References (2)

https://github.com/electron-userland/electron-builder/commit/22a7532bd01b9fb42cff7c58d599c7ad683569fe [Patch]
https://github.com/electron-userland/electron-builder/security/advisories/GHSA-p2f4-r6v6-j797 [Vendor Advisory, Exploit, Mitigation, Patch]

Authoritative record: CVE-2026-54673 at cve.org

Vendors: electron-userland

Weaknesses: CWE-200

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-54673 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.