CVE-2026-55587 AliasVault: Browser extension WebAuthn bridge accepts forged origin/RP ID
A malicious website can forge origin and relying-party values to obtain valid passkey assertions for other sites if the user approves the prompt.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-55587?
CVE-2026-55587 is a high-severity vulnerability in aliasvault, published on 15 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-346
Which versions are affected by CVE-2026-55587?
How do I fix CVE-2026-55587?
No fix has been published for CVE-2026-55587 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-55587 being exploited?
There is no known exploitation of CVE-2026-55587 in the wild and no public exploit code.
Sources
Also known as GHSA-f99p-jfhr-6ffc.