Information disclosure in Electron Builder-Util-Runtime
CVE-2026-54673
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.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (32.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 32.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002
Affected products
- Electron Builder-Util-Runtime
- Electron Electron-Builder
- Electron-Userland Builder-Util-Runtime — versions < 9.7.0
- Electron-Userland Electron-Builder — versions < 26.15.0
Weakness classification (CWE)
References
- github.com/electron-userland/electron-builder/security/advisories/GHSA-p2f4-r6v… (Exploit, Patch, Mitigation, Vendor Advisory)
- github.com/electron-userland/electron-builder/commit/22a7532bd01b9fb42cff7c58d5… (Patch)
Frequently asked questions
- What is CVE-2026-54673?
- CVE-2026-54673 is a medium-severity vulnerability in Electron Builder-Util-Runtime, classified under Information Disclosure. CVSS score: 6.5/10. Published 2026-06-30.
- How severe is CVE-2026-54673?
- Medium severity. CVSS v3 base score is 6.5 out of 10.