CVE-2026-33976
Stored XSS in Notesnook clipper enables desktop RCE.
Is CVE-2026-33976 being exploited?
Not confirmed. CVE-2026-33976 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.71% probability of exploitation in the next 30 days.
How severe is CVE-2026-33976?
CVE-2026-33976 is rated Critical with a CVSS score of 9.6. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-33976?
Yes. A fix has been recorded for CVE-2026-33976. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-33976 affect?
CVE-2026-33976 affects Notesnook Web/Desktop < 3.3.11, Notesnook Android < 3.3.17, Notesnook iOS < 3.3.17. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-33976?
Upgrade to 3.3.11+ (Web/Desktop) or 3.3.17+ (Android/iOS).
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
RCE on Notesnook desktop via crafted clip content; unsandboxed iframe with nodeIntegration enabled.
Immediate action required
- affected< 3.3.17
- affected< 3.3.11
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.