CVE-2026-55587Network attack vectorHinoki check available

Cross-site authentication via forged passkey origins

Published Oct 15, 2026 · Updated Oct 15, 2026

Origin validation failure in AliasVault's extension before 0.29.4 allows remote attackers to obtain cross-site passkey assertions. Its WebAuthn bridge accepts webpage-supplied origin and relying-party identifiers without binding them to the actual requesting website. Exploitation requires a malicious page, an installed and unlocked extension configured as a passkey provider, a stored passkey for the impersonated site, and manual prompt approval; the result is an assertion for that site, not disclosure of the vault or master password.

CVSS severity8.1
High
EPSS probability0.15%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Origin validation failure in AliasVault's extension before 0.29.4 allows remote attackers to obtain cross-site passkey assertions. Its WebAuthn bridge accepts webpage-supplied origin and relying-party identifiers without binding them to the actual requesting website. Exploitation requires a malicious page, an installed and unlocked extension configured as a passkey provider, a stored passkey for the impersonated site, and manual prompt approval; the result is an assertion for that site, not disclosure of the vault or master password.

The record

CVE
CVE-2026-55587
Published
Oct 15, 2026
Updated
Oct 15, 2026
Vendor
AliasVault
Product
AliasVault
Classifications
CWE-346, T1606
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.29.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

AliasVault · AliasVaultversion=< 0.29.4

Published CVSS scores

8.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-346Origin Validation Error
T1606Forge Web Credentials

Public exploit references

No public exploit references are available in this record.

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Technologies

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