CVE-2026-33976: Notesnook is a note-taking app

Q: How do I fix CVE-2026-33976?

notesnook desktop: upgrade to 3.3.11; notesnook mobile: upgrade to 3.3.17; notesnook mobile: upgrade to 3.3.17. Exact commands for each OS are on this page.

Q: Is CVE-2026-33976 being exploited?

CVE-2026-33976 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-2026-33976 affect?

CVE-2026-33976 affects notesnook desktop, notesnook mobile, notesnook mobile. Severity is critical (CVSS 9.6). Notesnook is a note-taking app. Prior to version 3.3.11 on Web/Desktop and 3.3.17 on Android/iOS, a stored XSS in the Web Clipper rendering flow can be escalated to remote code execution in the desktop app. The root cause is that the clippe

Q: How urgent is CVE-2026-33976?

Priority 52/100. Critical severity; Public exploit reference

This month

CRITICAL 9.6UPGRADEUPGRADEUPGRADE

CVE-2026-33976 is a critical-severity flaw (CVSS 9.6) affecting notesnook desktop, notesnook mobile, notesnook mobile. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Notesnook is a note-taking app. Prior to version 3.3.11 on Web/Desktop and 3.3.17 on Android/iOS, a stored XSS in the Web Clipper rendering flow can be escalated to remote code execution in the desktop app. The root cause is that the clipper preserves attacker-controlled attributes from the source page’s root element and stores them inside web-clip HTML. When the clip is later opened, Notesnook renders that HTML into a same-origin, unsandboxed if

Why this priority

Critical severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-79, CWE-94
Published	2026-03-27
Last modified	2026-10-26

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

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-27 22:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

streetwriters notesnook desktop UPGRADE

Affected: < 3.3.11

Fixed in: 3.3.11

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy notesnook-desktop || rpm -q notesnook-desktop || notesnook-desktop --version

2. UPGRADE to 3.3.11 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade notesnook-desktop

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade notesnook-desktop

Note

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

streetwriters notesnook mobile UPGRADE

Affected: < 3.3.17

Fixed in: 3.3.17

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy notesnook-mobile || rpm -q notesnook-mobile || notesnook-mobile --version

2. UPGRADE to 3.3.17 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade notesnook-mobile

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade notesnook-mobile

Note

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

streetwriters notesnook mobile UPGRADE

Affected: < 3.3.17

Fixed in: 3.3.17

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy notesnook-mobile || rpm -q notesnook-mobile || notesnook-mobile --version

2. UPGRADE to 3.3.17 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade notesnook-mobile

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade notesnook-mobile

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-2026-33976?

notesnook desktop: upgrade to 3.3.11; notesnook mobile: upgrade to 3.3.17; notesnook mobile: upgrade to 3.3.17. Exact commands for each OS are on this page.

Is CVE-2026-33976 being exploited?

CVE-2026-33976 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-2026-33976 affect?

CVE-2026-33976 affects notesnook desktop, notesnook mobile, notesnook mobile. Severity is critical (CVSS 9.6). Notesnook is a note-taking app. Prior to version 3.3.11 on Web/Desktop and 3.3.17 on Android/iOS, a stored XSS in the Web Clipper rendering flow can be escalated to remote code execution in the desktop app. The root cause is that the clippe

How urgent is CVE-2026-33976?

Priority 52/100. Critical severity; Public exploit reference

Software pages

Android vulnerabilities · iOS vulnerabilities

Related CVEs

CVE-2026-42090 CRITICAL 9.6 UPGRADE UPGRADE Notesnook is a note-taking app focused on user privacy & ease of use
CVE-2026-33955 HIGH 8.6 UPGRADE Notesnook is a note-taking app

References

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