CVE-2026-34780

MEDIUMNVD 6.16.1
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 6.1 under NVD CVSS v3. EPSS exploit probability: 0.3% (25th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3

Also known asEUVD-2026-18961 (ENISA EUVD)Source: ENISA EUVD

6.1EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 6.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. From versions 39.0.0-alpha.1 to before 39.8.0, 40.0.0-alpha.1 to before 40.7.0, and 41.0.0-alpha.1 to before 41.0.0-beta.8, apps that pass VideoFrame objects (from the WebCodecs API) across the contextBridge are vulnerable to a context isolation bypass. An attacker who can execute JavaScript in the main world (for example, via XSS) can use a bridged VideoFrame to gain access to the isolated world, including any Node.js APIs exposed to the preload script. Apps are only affected if a preload script returns, resolves, or passes a VideoFrame object to the main world via contextBridge.exposeInMainWorld(). Apps that do not bridge VideoFrame objects are not affected. This issue has been patched in versions 39.8.0, 40.7.0, and 41.0.0-beta.8.

CVSS v3
6.1
EG Score
6.1MEDIUMmedium confidence
EG Risk
28
EG Risk 28/100

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)
Severity61% × 45%
Impact severity (EG Severity): CVSS 6.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (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: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
25th
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 (6.1): severity, escalated by confirmed exploitation. This CVE's 6.1 is its impact severity (EG Severity), not escalated.

EG Severity
6.1 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS. 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 or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (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.

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

April 4, 2026

Last Modified

July 24, 2026

Advisory Details (1)

Auto-updated Jun 8, 2026
Patch available. Sources: github.
GitHub advisoryMentions a patch (unverified)

Context Isolation bypass via contextBridge VideoFrame transfer · Advisory · electron/electron · GitHub

https://github.com/electron/electron/security/advisories/GHSA-jfqg-hf23-qpw2

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
electron—
  • 39.0.0-alpha.1 up to 39.8.0: fixed in 39.8.0
  • 40.0.0-alpha.1 up to 40.7.0: fixed in 40.7.0
  • 41.0.0-alpha.1 up to 41.0.0-beta.8: fixed in 41.0.0-beta.8
—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 36× 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 99 of 210 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. 1 repeat row among the latest 100 is merged into the row it repeats. The 111 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  2. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  3. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  4. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  5. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  6. 2026-10-25 14:33 UTCEG score recompute
  7. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  8. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  9. 2026-10-23 03:18 UTCEG score recompute
  10. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  11. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  12. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  13. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  14. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  15. 2026-10-18 03:45 UTCEG score recompute
  16. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  17. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  18. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  19. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  20. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  21. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  22. 2026-10-12 16:12 UTCEG score recompute
  23. 2026-10-11 19:54 UTCEG score recompute
  24. 2026-10-11 17:07 UTCEG score recompute
  25. 2026-10-11 14:34 UTCEG score recompute
Show 74 more
  1. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  2. 2026-10-10 23:52 UTCOSV refresh
  3. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  4. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  5. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  6. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  7. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  8. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  9. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  10. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  11. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  12. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  13. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  14. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  15. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  16. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  17. 2026-09-21 12:19 UTCOSV refresh
  18. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  19. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  20. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  21. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  22. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  23. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  24. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  25. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  26. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  27. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  28. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  29. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  30. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  31. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  32. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  33. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  34. 2026-09-02 10:04 UTCOSV refresh
  35. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  36. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  37. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  38. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  39. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  40. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  41. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  42. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  43. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  44. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  45. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  46. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  47. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  48. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  49. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  50. 2026-08-16 08:32 UTCEG score recompute
  51. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  52. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  53. 2026-08-14 05:39 UTCEG score recompute
  54. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  55. 2026-08-12 19:55 UTCEG score recompute
  56. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  57. 2026-08-11 04:00 UTCEG score recompute
  58. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  59. 2026-08-10 04:36 UTCEG score recompute
  60. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  61. 2026-08-09 05:11 UTCEG score recompute
  62. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  63. 2026-08-07 15:17 UTCEG score recompute
  64. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  65. 2026-08-06 00:14 UTCEG score recompute
  66. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  67. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  68. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  69. 2026-08-03 22:36 UTCEG score recompute
  70. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  71. 2026-08-02 14:32 UTCEG score recompute
  72. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  73. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  74. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.3% · 25th percentile

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Frequently asked(5)

What is CVE-2026-34780?
CVE-2026-34780 is a medium-severity vulnerability; its CVE record was published on April 4, 2026. Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. From versions 39.0.0-alpha.1 to before 39.8.0, 40.0.0-alpha.1 to before 40.7.0, and 41.0.0-alpha.1 to before 41.0.0-beta.8, apps that pass VideoFrame objects (from the WebCodecs API) across the…
When was the CVE record for CVE-2026-34780 published?
The CVE record for CVE-2026-34780 was published on April 4, 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 July 24, 2026; the record at its source may have been updated since.
Is CVE-2026-34780 actively exploited?
CVE-2026-34780 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (25th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-34780?
CVE-2026-34780 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-34780?
A fix for CVE-2026-34780 is available: update to the fixed version the vendor names in its advisory.

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