CVE-2026-67338

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreHIGH 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%CVSS: 6.1Exploit: None knownExposed: 0

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

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
6.1(high)
EG Risk
28(Track)
EG Risk 28/100SSVC: Track

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%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
7%
KEV
Not listed

Published

August 1, 2026

Last Modified

August 3, 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
github Patch Available

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 rangeFixed inDependents
jupyterlab4.0.11+ds1+~cs11.25.27-7 ... 4.4.8+ds1+~3.1.0+~0.16.6+~cs1.4.4-1 (26 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
jupyterlab4.0.11+ds1+~cs11.25.27-7 ... 4.4.8+ds1+~3.1.0+~0.16.6+~cs1.4.4-1 (26 versions)——
PyPI(1)
PackageVulnerable rangeFixed inDependents
jupyterlab0.0.1 ... 4.5.8 (586 versions)4.5.9—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 60× 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.

  1. 2026-08-20 22:56 UTCEPSS rescore
  2. 2026-08-20 10:35 UTCEG score recompute
  3. 2026-08-20 10:35 UTCGHSA enrichment
  4. 2026-08-19 17:04 UTCEPSS rescore
  5. 2026-08-19 09:42 UTCEG score recompute
  6. 2026-08-19 09:42 UTCGHSA enrichment
  7. 2026-08-18 13:48 UTCEPSS rescore
  8. 2026-08-18 08:41 UTCEG score recompute
  9. 2026-08-18 08:41 UTCGHSA enrichment
  10. 2026-08-17 13:47 UTCEPSS rescore
  11. 2026-08-17 07:42 UTCEG score recompute
  12. 2026-08-17 07:42 UTCGHSA enrichment
  13. 2026-08-16 14:56 UTCEPSS rescore
  14. 2026-08-16 06:50 UTCEG score recompute
  15. 2026-08-16 06:50 UTCGHSA enrichment
  16. 2026-08-15 05:58 UTCEG score recompute
  17. 2026-08-15 05:58 UTCGHSA enrichment
  18. 2026-08-15 01:30 UTCEPSS rescore
  19. 2026-08-14 05:05 UTCEG score recompute
  20. 2026-08-14 05:05 UTCGHSA enrichment
  21. 2026-08-13 22:00 UTCEPSS rescore
  22. 2026-08-13 04:12 UTCEG score recompute
  23. 2026-08-13 04:12 UTCGHSA enrichment
  24. 2026-08-12 13:51 UTCEPSS rescore
  25. 2026-08-12 03:20 UTCEG score recompute
Show 35 more
  1. 2026-08-12 03:20 UTCGHSA enrichment
  2. 2026-08-11 02:27 UTCEG score recompute
  3. 2026-08-11 02:27 UTCGHSA enrichment
  4. 2026-08-11 00:00 UTCEPSS rescore
  5. 2026-08-10 01:35 UTCEG score recompute
  6. 2026-08-10 01:35 UTCGHSA enrichment
  7. 2026-08-09 13:47 UTCEPSS rescore
  8. 2026-08-09 00:43 UTCEG score recompute
  9. 2026-08-09 00:43 UTCGHSA enrichment
  10. 2026-08-08 16:37 UTCEPSS rescore
  11. 2026-08-07 23:51 UTCEG score recompute
  12. 2026-08-07 23:51 UTCGHSA enrichment
  13. 2026-08-06 22:58 UTCEG score recompute
  14. 2026-08-06 22:58 UTCGHSA enrichment
  15. 2026-08-06 13:47 UTCEPSS rescore
  16. 2026-08-05 22:06 UTCEG score recompute
  17. 2026-08-05 22:06 UTCGHSA enrichment
  18. 2026-08-05 19:17 UTCEPSS rescore
  19. 2026-08-05 19:17 UTCEPSS rescore
  20. 2026-08-04 21:14 UTCEG score recompute
  21. 2026-08-04 21:13 UTCGHSA enrichment
  22. 2026-08-04 15:10 UTCEPSS rescore
  23. 2026-08-04 10:39 UTCEPSS rescore
  24. 2026-08-03 20:20 UTCEG score recompute
  25. 2026-08-03 20:20 UTCGHSA enrichment
  26. 2026-08-03 20:14 UTCEG score recompute
  27. 2026-08-03 20:14 UTCGHSA enrichment
  28. 2026-08-03 15:06 UTCEG score recompute
  29. 2026-08-03 15:06 UTCGHSA enrichment
  30. 2026-08-03 10:36 UTCEPSS rescore
  31. 2026-08-02 14:12 UTCEG score recompute
  32. 2026-08-02 14:12 UTCGHSA enrichment
  33. 2026-08-01 13:19 UTCEG score recompute
  34. 2026-08-01 12:44 UTCEG score recompute
  35. 2026-08-01 12:42 UTCMITRE cvelistV5first tracked

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 in the National Vulnerability Database on August 1, 2026, with the most recent update on August 3, 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% probability of exploitation in the next 30 days, which ranks it in the top 92.8% of all scored CVEs.
What is the CVSS score of CVE-2026-67338?
CVE-2026-67338 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-67338?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-67338, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-67338

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