CVE-2026-33976
Notesnook vulnerable to RCE via stored XSS in Web Clipper rendering
Description
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 iframe using `contentDocument.write(...)`. Event-handler attributes such as `onload`, `onclick`, or `onmouseover` execute in the Notesnook origin. In the desktop app, this becomes RCE because Electron is configured with `nodeIntegration: true` and `contextIsolation: false`. Version 3.3.11 Web/Desktop and 3.3.17 on Android/iOS patch the issue.
INFO
Published Date :
March 27, 2026, 10:16 p.m.
Last Modified :
March 31, 2026, 6:21 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-33976
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 3.1 | CRITICAL | MITRE-CVE |
Solution
- Update Web/Desktop to version 3.3.11.
- Update Android/iOS to version 3.3.17.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-33976.
| URL | Resource |
|---|---|
| https://github.com/streetwriters/notesnook/security/advisories/GHSA-f42f-phvp-43x5 | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-33976 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-33976
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-33976 vulnerability anywhere in the article.
-
Daily CyberSecurity
Zero Authentication, Total Control: Critical CVSS 10 Flaw Uncovered in Dgraph Database
A security vulnerability was found in Dgraph, the high-performance, horizontally scalable GraphQL database. The flaw, designated as CVE-2026-33976, has been assigned a rare CVSS score of 10.0, the hig ... Read more
The following table lists the changes that have been made to the
CVE-2026-33976 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Mar. 31, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:streetwriters:notesnook_desktop:*:*:*:*:*:*:*:* versions up to (excluding) 3.3.11 *cpe:2.3:a:streetwriters:notesnook_mobile:*:*:*:*:*:android:*:* versions up to (excluding) 3.3.17 *cpe:2.3:a:streetwriters:notesnook_mobile:*:*:*:*:*:iphone_os:*:* versions up to (excluding) 3.3.17 Added Reference Type GitHub, Inc.: https://github.com/streetwriters/notesnook/security/advisories/GHSA-f42f-phvp-43x5 Types: Exploit, Vendor Advisory -
New CVE Received by [email protected]
Mar. 27, 2026
Action Type Old Value New Value Added Description 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 iframe using `contentDocument.write(...)`. Event-handler attributes such as `onload`, `onclick`, or `onmouseover` execute in the Notesnook origin. In the desktop app, this becomes RCE because Electron is configured with `nodeIntegration: true` and `contextIsolation: false`. Version 3.3.11 Web/Desktop and 3.3.17 on Android/iOS patch the issue. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H Added CWE CWE-79 Added CWE CWE-94 Added Reference https://github.com/streetwriters/notesnook/security/advisories/GHSA-f42f-phvp-43x5