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TI-2026-21236 Aliases CVE-2026-26266

AliasVault affected by Cross-Site Scripting (XSS) via Email HTML Rendering

Priority MEDIUM 42CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

AliasVault is a privacy-first password manager with built-in email aliasing. A stored cross-site scripting (XSS) vulnerability was identified in the email rendering feature of AliasVault Web Client versions 0.25.3 and lower. When viewing received emails on an alias, the HTML content is rendered in an iframe using srcdoc, which does not provide origin isolation. An attacker can send a crafted email containing malicious JavaScript to any AliasVault email alias. When the victim views the email in the web client, the script executes in the same origin as the application. No sanitization or sandboxing was applied to email HTML content before rendering. This vulnerability is fixed in 0.26.0.[

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00278 20th percentileScored 2026-11-07
Fix Fixed aliasvault (aliasvault): 0.26.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
aliasvaultaliasvaultbefore 0.26.00.26.0Patch availableCNA
  • aliasvault Vendoraliasvault Affected before 0.26.0 Fixed in 0.26.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:aliasvault:aliasvault:*:*:*:*:*:*:*:*before 0.26.0Vulnerablealiasvault
  • cpe:2.3:a:aliasvault:aliasvault:*:*:*:*:*:*:*:* Versions before 0.26.0 Vulnerable ·aliasvault

Remediation

  • Fix · CNA aliasvault (aliasvault) Fixed in 0.26.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-26266

References

Patch 2

Other 1

  • TI-2026-02566 AliasVault App Backup aliasvault.xml backup CVSS 4.0LOW 2.0
  • TI-2026-18221 AliasVault is Missing Origin Validation in Android Passkey Credential Provider CVSS 3.1MEDIUM 6.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences