CVE-2026-33976

CRITICALPre-NVD 9.69.6
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This critical-severity CVE scores 9.6 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.7% (53rd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated

Also known asEUVD-2026-16874 (ENISA EUVD)Source: ENISA EUVD

9.6EG
EchelonGraph verdictPlan mitigationNo fix is confirmed yet: check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 9.6Exploit: No code on recordExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

The CVE record's description, written by its CNA (GitHub, Inc.), states the affected versions: "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." No release containing a fix is confirmed on record.

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.

CVSS v3
9.6
EG Score
9.6CRITICALmedium confidence
EG Risk
59
EG Risk 59/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity96% × 45%
Impact severity (EG Severity): CVSS 9.6 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high.
EPSS PROB
0.7%
EPSS %ILE
53rd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.6): severity, escalated by confirmed exploitation. This CVE's 9.6 is its impact severity (EG Severity), not escalated.

EG Severity
9.6 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.7% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-01). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track* at medium mission impactTrack at low, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

March 27, 2026

Last Modified

October 26, 2026

Advisory Details (1)

Auto-updated Oct 7, 2026
No fix on record yet. Sources: github.
GitHub advisoryMentions a patch (unverified)

RCE via stored XSS in Web Clipper rendering · Advisory · streetwriters/notesnook · GitHub

https://github.com/streetwriters/notesnook/security/advisories/GHSA-f42f-phvp-43x5

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 55× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 98 of 124 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 2 repeat rows among the latest 100 are merged into the row they repeat. The 26 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 06:44 UTCEG score recompute
  2. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  3. 2026-11-01 05:12 UTCEG score recompute
  4. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  5. 2026-10-31 03:39 UTCEG score recompute
  6. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  7. 2026-10-30 02:07 UTCEG score recompute
  8. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
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  10. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  11. 2026-10-27 23:00 UTCEG score recompute
  12. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  13. 2026-10-26 21:26 UTCEG score recompute
  14. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  15. 2026-10-25 21:00 UTCEG score recompute
  16. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  17. 2026-10-25 14:34 UTCEG score recompute
  18. 2026-10-24 19:28 UTCEG score recompute
  19. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  20. 2026-10-23 17:54 UTCEG score recompute
  21. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  22. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  23. 2026-10-22 16:21 UTCEG score recompute
  24. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  25. 2026-10-21 14:46 UTCEG score recompute
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  1. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  2. 2026-10-20 13:14 UTCEG score recompute
  3. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  4. 2026-10-19 11:40 UTCEG score recompute
  5. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  6. 2026-10-18 03:46 UTCEG score recompute
  7. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  8. 2026-10-17 03:18 UTCEG score recompute
  9. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  10. 2026-10-16 01:44 UTCEG score recompute
  11. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  12. 2026-10-14 21:14 UTCEG score recompute
  13. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  14. 2026-10-13 17:11 UTCEG score recompute
  15. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  16. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  17. 2026-10-12 15:34 UTCEG score recompute
  18. 2026-10-11 19:55 UTCEG score recompute
  19. 2026-10-11 17:08 UTCEG score recompute
  20. 2026-10-11 14:35 UTCEG score recompute
  21. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  22. 2026-10-11 04:01 UTCOSV refresh
  23. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  24. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  25. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  26. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  27. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  28. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  29. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  30. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  31. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  32. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  33. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  34. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  35. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  36. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  37. 2026-09-21 15:49 UTCOSV refresh
  38. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  39. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  40. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  41. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  42. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  43. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  44. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  45. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  46. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  47. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  48. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  49. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  50. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  51. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  52. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  53. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  54. 2026-09-02 13:04 UTCOSV refresh
  55. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  56. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  57. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.7% · 50th percentile
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  60. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  61. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.7% · 50th percentile
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  65. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.7% · 50th percentile
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  70. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  71. 2026-08-16 09:55 UTCEG score recompute
  72. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  73. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.7% · 50th percentile

Frequently asked(5)

What is CVE-2026-33976?
CVE-2026-33976 is a critical-severity vulnerability; its CVE record was published on March 27, 2026. 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…
When was the CVE record for CVE-2026-33976 published?
The CVE record for CVE-2026-33976 was published on March 27, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 26, 2026; the record at its source may have been updated since.
Is CVE-2026-33976 actively exploited?
CVE-2026-33976 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (53rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-33976?
CVE-2026-33976 has a CVSS base score of 9.6 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-33976?
No fix for CVE-2026-33976 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The CVE record's description, written by its CNA (GitHub, Inc.), states the affected versions: "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." No release containing a fix is confirmed on record.

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