High 8.1Published Oct 15, 2026

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

Updated under an hour ago (2026-10-19 08:00 UTC)

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It affects aliasvault. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.15%, higher than 4% of scored CVEs.

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Exploited in the last 30 days

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.

CVSS: 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Weakness (CWE): CWE-346
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.15% (percentile 4)
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 15, 2026

Affected products

Affected products

aliasvault aliasvault aliasvault:aliasvault (from the name)	before 0.29.4	CNA record

References

https://github.com/aliasvault/aliasvault/security/advisories/GHSA-f99p-jfhr-6ffcx-refsource-confirm
https://github.com/aliasvault/aliasvault/commit/a60d0966e66ecf4f6558dc40e3feb1313072ce2bx-refsource-misc
https://github.com/aliasvault/aliasvault/releases/tag/0.29.4x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.