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CVE-2026-26266: AliasVault affected by Cross-Site Scripting (XSS) via Email HTML Rendering

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-03 · updated 2026-06-17
• Weakness: CWE-79

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

• aliasvault: before 0.26.0 — fixed in 0.26.0

How to fix

Upgrade to a fixed version: aliasvault 0.26.0. Check the vendor advisory for mitigations.

References

• https://github.com/aliasvault/aliasvault/commit/382e2e96fa502891638a48404f6d82dc972ab481
• https://github.com/aliasvault/aliasvault/releases/tag/0.26.0
• https://github.com/aliasvault/aliasvault/security/advisories/GHSA-f65p-p65r-g53q

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