CVE-2026-26266: AliasVault is a privacy-first password manager with built-in email aliasing

Q: How do I fix CVE-2026-26266?

aliasvault: upgrade to 0.26.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-26266 being exploited?

CVE-2026-26266 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-26266 affect?

CVE-2026-26266 affects aliasvault. Severity is critical (CVSS 9.3). 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 re

Q: How urgent is CVE-2026-26266?

Priority 38/100. Critical severity

This month

CRITICAL 9.3UPGRADE

CVE-2026-26266 is a critical-severity flaw (CVSS 9.3) affecting aliasvault. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity

A fixed release or distro patch exists.

Risk facts

CVSS score	9.3 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 80%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-03-03
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: aliasvault

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-03 23:15 UTCPublished CVE record published
2026-06-17 10:26 UTCUpdated Record last modified

aliasvault aliasvault UPGRADE

Affected: < 0.26.0

Fixed in: 0.26.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy aliasvault || rpm -q aliasvault || aliasvault --version

2. UPGRADE to 0.26.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade aliasvault

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade aliasvault

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-26266?

aliasvault: upgrade to 0.26.0. Exact commands for each OS are on this page.

Is CVE-2026-26266 being exploited?

CVE-2026-26266 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-26266 affect?

CVE-2026-26266 affects aliasvault. Severity is critical (CVSS 9.3). 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 re

How urgent is CVE-2026-26266?

Priority 38/100. Critical severity

Related CVEs

CVE-2026-2974 LOW 2.5 UPGRADE A vulnerability was identified in AliasVault App up to 0.25.3 on Android/iOS
CVE-2026-22694 MEDIUM 6.1 UPGRADE AliasVault is a privacy-first password manager with built-in email aliasing

References

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