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CVE-2026-55587— AliasVault: Browser extension WebAuthn bridge accepts forged origin/RP ID

Quick assessment

Affected
aliasvault aliasvault
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.

AliasVault 是一款以隐私保护为核心的密码管理器，内置电子邮件别名功能。在 0.29.4 版本之前，AliasVault 浏览器扩展程序的通行密钥（Passkey）提供者未将通行密钥请求绑定到实际的网页来源（origin），也未验证所请求的依赖方标识符（relying-party identifier）是否与当前网站一致。恶意网站可提供伪造的来源和依赖方标识符；如果拥有匹配存储通行密钥的受害者批准了 AliasVault 的通行密钥提示，攻击者即可获取针对另一网站的合法断言（assertion）。 成功利用

CVSS 8.1 · High

Possible ATT&CK Techniques 1 AI

T1528 · Steal Application Access Token

Affected Version Matrix 1

VendorProduct Version RangeStatus
aliasvault aliasvault < 0.29.4 affected
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I. Basic Information for CVE-2026-55587

Vulnerability Information
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Vulnerability Title
AliasVault: Browser extension WebAuthn bridge accepts forged origin/RP ID
Source: CVE Program / CVE List V5
Vulnerability Description
AliasVault is a privacy-first password manager with built-in email aliasing. Prior to 0.29.4, the AliasVault browser extension passkey provider does not bind passkey requests to the actual webpage origin or verify that the requested relying-party identifier matches the current website. A malicious website can provide forged origin and relying-party values and, if a victim with a matching stored passkey approves the AliasVault passkey prompt, obtain a valid assertion for a different website. Exploitation requires the extension to be installed, unlocked, and configured as a passkey provider, requires a stored passkey for the impersonated site, and cannot occur silently because the victim must approve the prompt. The server, web application, and mobile applications are not affected. This issue is fixed in version 0.29.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
aliasvault aliasvault < 0.29.4 -

II. Public POCs for CVE-2026-55587

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III. Intelligence Information for CVE-2026-55587

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Vendor Advisories for CVE-2026-55587 (1)

Vendor Pages for CVE-2026-55587 (1)

IV. Related Vulnerabilities

Same product: aliasvault
Same vendor: aliasvault
Same weakness: CWE-346

V. Comments for CVE-2026-55587

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