Vulnerability · Published Mar 3, 2026 · Assigned by GitHub_M
CVE-2026-26266AliasVault affected by Cross-Site Scripting (XSS) via Email HTML Rendering
Critical 9.3
In plain English
A critical-severity cross-site scripting in aliasvault from aliasvault. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities).
Official description
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.[
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| aliasvault | aliasvault | < 0.26.0 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N