CVE-2026-67338

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

Score 6.1 from GitHub Security Advisory published 2026-08-01. A secondary CVSS source baseline 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • 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.

JupyterLab before 4.5.9 contains a stored cross-site scripting vulnerability in the Extension Manager that fails to validate URI protocols in package metadata URLs. Attackers can publish malicious PyPI packages with javascript: URLs in project metadata that execute arbitrary JavaScript in the JupyterLab origin when users click the extension name.

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

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity61% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
21st
KEV
Not listed

CISA SSVCTrack at every mission impact level.

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 1, 2026

Last Modified

October 8, 2026

Advisory Details (4)

Auto-updated Aug 1, 2026
Patch available. Sources: github, github_commit.
generic

JupyterLab before 4.5.9 Stored XSS via Extension Manager | Advisories | VulnCheck

https://www.vulncheck.com/advisories/jupyterlab-before-stored-xss-via-extension-manager
github_commit

commit d5d961f6e10a (jupyterlab/jupyterlab)

Fix landed in jupyterlab/jupyterlab commit d5d961f6e10a — awaiting tagged release

https://github.com/jupyterlab/jupyterlab/commit/d5d961f6e10a6442dddbf94d9a976b3897055a12
github_commit

commit 4e61e07d0a91 (jupyterlab/jupyterlab)

Fix landed in jupyterlab/jupyterlab commit 4e61e07d0a91 — awaiting tagged release

https://github.com/jupyterlab/jupyterlab/commit/4e61e07d0a91145b53fbf96ac74b0387f6bc51f6
githubMentions a patch (unverified)

Stored XSS in extension manager through package metadata unsanitized URI protocol · Advisory · jupyterlab/jupyterlab · GitHub

https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-vmhf-c436-hxj4

Vendor Advisories for CVE-2026-67338(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(3 across 3 ecosystems)
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
jupyterlab4.0.11+ds1+~cs11.25.27-7 ... 4.4.8+ds1+~3.1.0+~0.16.6+~cs1.4.4-1 (29 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
jupyterlab4.0.11+ds1+~cs11.25.27-7 ... 4.4.8+ds1+~3.1.0+~0.16.6+~cs1.4.4-1 (26 versions)
  • every version up to 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-4: fixed in 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-4
—
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
jupyterlab0.0.1 ... 4.5.8 (586 versions)
  • every version up to 4.5.9: fixed in 4.5.9
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 16× in last 7d / 64× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 172 total refreshes for this CVE.

  1. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:13 UTCEPSS rescore
  3. 2026-10-08 16:38 UTCEG score recompute
  4. 2026-10-08 16:38 UTCGHSA enrichment
  5. 2026-10-08 15:44 UTCEG score recompute
  6. 2026-10-08 15:44 UTCGHSA enrichment
  7. 2026-10-07 23:48 UTCEPSS rescore
  8. 2026-10-06 23:48 UTCEG score recompute
  9. 2026-10-06 23:48 UTCGHSA enrichment
  10. 2026-10-06 15:18 UTCEPSS rescore
  11. 2026-10-05 19:52 UTCEG score recompute
  12. 2026-10-05 19:52 UTCGHSA enrichment
  13. 2026-10-05 17:43 UTCEPSS rescore
  14. 2026-10-04 06:26 UTCEG score recompute
  15. 2026-10-04 06:26 UTCGHSA enrichment
  16. 2026-10-03 14:26 UTCEPSS rescore
  17. 2026-10-02 17:56 UTCEPSS rescore
  18. 2026-10-02 10:29 UTCEG score recompute
  19. 2026-10-02 10:29 UTCGHSA enrichment
  20. 2026-10-01 19:50 UTCEPSS rescore
  21. 2026-10-01 02:43 UTCEG score recompute
  22. 2026-10-01 02:43 UTCGHSA enrichment
  23. 2026-09-30 15:03 UTCEPSS rescore
  24. 2026-09-29 06:47 UTCEG score recompute
  25. 2026-09-29 06:47 UTCGHSA enrichment
Show 75 more
  1. 2026-09-28 13:52 UTCEPSS rescore
  2. 2026-09-27 18:22 UTCEG score recompute
  3. 2026-09-27 18:22 UTCGHSA enrichment
  4. 2026-09-27 13:48 UTCEPSS rescore
  5. 2026-09-26 15:59 UTCEPSS rescore
  6. 2026-09-25 09:49 UTCEG score recompute
  7. 2026-09-25 09:49 UTCGHSA enrichment
  8. 2026-09-24 08:57 UTCEG score recompute
  9. 2026-09-24 08:57 UTCGHSA enrichment
  10. 2026-09-23 17:54 UTCEPSS rescore
  11. 2026-09-23 08:05 UTCEG score recompute
  12. 2026-09-23 08:05 UTCGHSA enrichment
  13. 2026-09-22 07:08 UTCEG score recompute
  14. 2026-09-22 07:08 UTCGHSA enrichment
  15. 2026-09-20 20:59 UTCEG score recompute
  16. 2026-09-20 20:59 UTCGHSA enrichment
  17. 2026-09-20 20:16 UTCEPSS rescore
  18. 2026-09-19 13:44 UTCEG score recompute
  19. 2026-09-19 13:44 UTCGHSA enrichment
  20. 2026-09-18 19:28 UTCEPSS rescore
  21. 2026-09-18 07:55 UTCEG score recompute
  22. 2026-09-18 07:55 UTCGHSA enrichment
  23. 2026-09-17 07:02 UTCEG score recompute
  24. 2026-09-17 07:02 UTCGHSA enrichment
  25. 2026-09-16 14:08 UTCEPSS rescore
  26. 2026-09-16 05:24 UTCEG score recompute
  27. 2026-09-16 05:24 UTCGHSA enrichment
  28. 2026-09-16 05:15 UTCEPSS rescore
  29. 2026-09-15 03:09 UTCGHSA enrichment
  30. 2026-09-14 02:15 UTCEG score recompute
  31. 2026-09-14 02:15 UTCGHSA enrichment
  32. 2026-09-13 01:23 UTCEG score recompute
  33. 2026-09-13 01:23 UTCGHSA enrichment
  34. 2026-09-12 00:30 UTCEG score recompute
  35. 2026-09-12 00:30 UTCGHSA enrichment
  36. 2026-09-11 14:53 UTCEPSS rescore
  37. 2026-09-11 09:37 UTCEPSS rescore
  38. 2026-09-10 22:01 UTCEG score recompute
  39. 2026-09-10 22:01 UTCGHSA enrichment
  40. 2026-09-09 21:05 UTCGHSA enrichment
  41. 2026-09-09 06:57 UTCEG score recompute
  42. 2026-09-09 06:57 UTCGHSA enrichment
  43. 2026-09-08 22:01 UTCEPSS rescore
  44. 2026-09-07 19:18 UTCEG score recompute
  45. 2026-09-07 19:18 UTCGHSA enrichment
  46. 2026-09-07 16:01 UTCEPSS rescore
  47. 2026-09-06 13:47 UTCEPSS rescore
  48. 2026-09-06 12:28 UTCEG score recompute
  49. 2026-09-06 12:27 UTCGHSA enrichment
  50. 2026-09-05 15:31 UTCEPSS rescore
  51. 2026-09-05 11:26 UTCEG score recompute
  52. 2026-09-05 11:26 UTCGHSA enrichment
  53. 2026-09-04 10:25 UTCEG score recompute
  54. 2026-09-04 10:25 UTCGHSA enrichment
  55. 2026-09-04 05:07 UTCEPSS rescore
  56. 2026-09-03 09:03 UTCEG score recompute
  57. 2026-09-03 09:03 UTCGHSA enrichment
  58. 2026-09-02 14:12 UTCEPSS rescore
  59. 2026-09-02 00:50 UTCEG score recompute
  60. 2026-09-02 00:50 UTCGHSA enrichment
  61. 2026-09-01 13:54 UTCEPSS rescore
  62. 2026-08-31 23:58 UTCEG score recompute
  63. 2026-08-31 23:58 UTCGHSA enrichment
  64. 2026-08-30 23:06 UTCEG score recompute
  65. 2026-08-30 23:06 UTCGHSA enrichment
  66. 2026-08-30 19:17 UTCEPSS rescore
  67. 2026-08-29 22:13 UTCEG score recompute
  68. 2026-08-29 22:13 UTCGHSA enrichment
  69. 2026-08-28 21:42 UTCEPSS rescore
  70. 2026-08-27 20:45 UTCEG score recompute
  71. 2026-08-27 20:45 UTCGHSA enrichment
  72. 2026-08-26 19:13 UTCEG score recompute
  73. 2026-08-26 19:13 UTCGHSA enrichment
  74. 2026-08-26 14:47 UTCEPSS rescore
  75. 2026-08-25 14:59 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-67338?
CVE-2026-67338 is a medium vulnerability published on August 1, 2026. JupyterLab before 4.5.9 contains a stored cross-site scripting vulnerability in the Extension Manager that fails to validate URI protocols in package metadata URLs. Attackers can publish malicious PyPI packages with javascript: URLs in project metadata that execute arbitrary JavaScript in the…
When was CVE-2026-67338 disclosed?
CVE-2026-67338 was first published on August 1, 2026, with the most recent update on October 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-67338 actively exploited?
CVE-2026-67338 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (21st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-67338?
CVE-2026-67338 has a CVSS base score of 6.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-67338?
A fix for CVE-2026-67338 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-67338 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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