High 8.2Published Jun 30, 2026

CVE-2026-54673electron-updater: Cross-origin redirect leaks `PRIVATE-TOKEN` and mixed-case `Authorization` credentials in `builder-util-runtime`

Updated under an hour ago (Oct 26, 2026, 3:50 PM ET)

This data is behind schedule: last updated Oct 26, 2026, 3:50 PM ET. We are working on it.Behind: CVE records (cvelistV5).

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It affects electron-userland electron-builder and 3 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for electron-userland electron-builder

Exploited in the last 30 days

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.

CVSS: 8.2 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
Weakness (CWE): CWE-200
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jul 1, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

electron-userland electron-builder electron_userland:electron_builder (from the name)	before 26.15.0	CNA record
electron-userland builder-util-runtime electron_userland:builder_util_runtime (from the name)	before 9.7.0	CNA record
electron builder-util-runtime electron:builder-util-runtime	before 9.7.0	NVD
electron electron-builder electron:electron-builder	before 26.15.0	NVD

References

References

https://github.com/electron-userland/electron-builder/security/advisories/GHSA-p2f4-r6v6-j797	x-refsource-confirm, vendor-advisory, exploit, mitigation, patch
https://github.com/electron-userland/electron-builder/commit/22a7532bd01b9fb42cff7c58d599c7ad683569fe	x-refsource-misc, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.