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

Quick assessment

Affected
electron-userland electron-builder
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Electron Userland electron-builder是Electron Userland组织的一款构建跨平台桌面应用的开发工具。 Electron Userland electron-builder存在信息泄露漏洞，该漏洞源于HTTP重定向处理函数只剥离了全小写“authorization”凭据标头，导致其他凭据标头（如PRIVATE-TOKEN和混合大小写的Authorization）未被剥离，可能被转发至攻击者控制的跨域重定向目标，从而泄露凭据。

AI Predicted 7.5 Difficulty: Easy EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1071 · Application Layer Protocol

Affected Version Matrix 2

VendorProduct Version RangeStatus
electron-userland builder-util-runtime < 9.7.0 affected
electron-userland electron-builder < 26.15.0 affected
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I. Basic Information for CVE-2026-54673

Vulnerability Information
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Vulnerability Title
electron-updater: Cross-origin redirect leaks `PRIVATE-TOKEN` and mixed-case `Authorization` credentials in `builder-util-runtime`
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Electron Userland electron-builder 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Electron Userland electron-builder是Electron Userland组织的一款构建跨平台桌面应用的开发工具。 Electron Userland electron-builder存在信息泄露漏洞，该漏洞源于HTTP重定向处理函数只剥离了全小写“authorization”凭据标头，导致其他凭据标头（如PRIVATE-TOKEN和混合大小写的Authorization）未被剥离，可能被转发至攻击者控制的跨域重定向目标，从而泄露凭据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
electron-userland electron-builder < 26.15.0 -
electron-userland builder-util-runtime < 9.7.0 -

II. Public POCs for CVE-2026-54673

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III. Intelligence Information for CVE-2026-54673

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Patches & Fixes for CVE-2026-54673 (1)

Vendor Advisories for CVE-2026-54673 (1)

IV. Related Vulnerabilities

Same product: electron-builder
Same vendor: electron-userland
Same weakness: CWE-200

V. Comments for CVE-2026-54673

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