CVE-2026-33430

HIGHNVD 7.37.3
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 7.3 under NVD CVSS v3. EPSS exploit probability: 0.1% (3rd 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
Trending — 3 sources updated this week
7.3EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 7.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Briefcase is a tool for converting a Python project into a standalone native application. Starting in version 0.3.0 and prior to version 0.3.26, if a developer uses Briefcase to produce an Windows MSI installer for a project, and that project is installed for All Users (i.e., per-machine scope), the installation process creates an directory that inherits all the permissions of the parent directory. Depending on the location chosen by the installing user, this may allow a low privilege but authenticated user to replace or modify the binaries installed by the application. If an administrator then runs the altered binary, the binary will run with elevated privileges. The problem is caused by the template used to generate the WXS file for Windows projects. It was fixed in the templates used in Briefcase 0.3.26, 0.4.0, and 0.4.1. Re-running briefcase create on your Briefcase project will result in the updated templates being used. As a workaround, the patch can be added to any existing Briefcase .wxs file generated by Briefcase 0.3.24 or later.

CVSS v3
7.3
EG Score
7.3HIGHmedium confidence
EG Risk
33
EG Risk 33/100

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 (value × EchelonGraph’s weight)
Severity73% × 45%
The EG Score, 7.3 of 10.
Exploitation0.1% × 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
0.1%
EPSS %ILE
3rd
KEV
Not listed

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

March 26, 2026

Last Modified

June 17, 2026

Advisory Details (4)

Auto-updated Aug 2, 2026
Patch available. Sources: github_pr, github.
GitHub advisoryMentions a patch (unverified)

Potential privilege escalation through MSI installers · Advisory · beeware/briefcase · GitHub

https://github.com/beeware/briefcase/security/advisories/GHSA-r3r2-35v9-v238
Web page

Privilege escalation with MSI installers · Issue #2759 · beeware/briefcase · GitHub

https://github.com/beeware/briefcase/issues/2759
GitHub pull request

Ensure that MSIs installed for all users don't inherit permissions.

Fix merged in beeware/briefcase-windows-app-template PR #86 on 2026-03-20 — awaiting tagged release

https://github.com/beeware/briefcase-windows-app-template/pull/86
GitHub pull request

Ensure that MSIs installed for all users don't inherit permissions.

Fix merged in beeware/briefcase-windows-VisualStudio-template PR #85 on 2026-03-20 — awaiting tagged release

https://github.com/beeware/briefcase-windows-VisualStudio-template/pull/85

Vendor Advisories for CVE-2026-33430(1)

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

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
briefcase0.3.0 ... 0.3.9 (30 versions)
  • 0.3.0 up to 0.3.26: fixed in 0.3.26
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 27× 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 93 of 177 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. 7 repeat rows among the latest 100 are merged into the row they repeat. The 84 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  2. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  3. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  4. 2026-10-12 16:13 UTCEG score recompute
  5. 2026-10-11 19:55 UTCEG score recompute
  6. 2026-10-11 17:09 UTCEG score recompute
  7. 2026-10-11 14:36 UTCEG score recompute
  8. 2026-10-11 04:31 UTCOSV refresh
  9. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  10. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  11. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  12. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  13. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  14. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  15. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  16. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  17. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  18. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  19. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  20. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  21. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  22. 2026-09-21 16:19 UTCOSV refresh
  23. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  24. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  25. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
Show 68 more
  1. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  2. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  3. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  4. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  5. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  6. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  7. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  8. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  9. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  10. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  11. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  12. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  13. 2026-09-02 13:26 UTCOSV refresh
  14. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  15. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  16. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  17. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  18. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  19. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  20. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  21. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  22. 2026-08-24 14:17 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  23. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  24. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  25. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  26. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  27. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  28. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  29. 2026-08-16 10:07 UTCEG score recompute
  30. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  31. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  32. 2026-08-14 06:25 UTCEG score recompute
  33. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  34. 2026-08-12 20:43 UTCEG score recompute
  35. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  36. 2026-08-11 20:50 UTCEG score recompute
  37. 2026-08-11 03:51 UTCEG score recompute
  38. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  39. 2026-08-09 17:02 UTCEG score recompute
  40. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  41. 2026-08-09 05:58 UTCEG score recompute
  42. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  43. 2026-08-08 03:27 UTCEG score recompute
  44. 2026-08-06 18:46 UTCEG score recompute
  45. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  46. 2026-08-06 00:52 UTCEG score recompute
  47. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  48. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  49. 2026-08-03 23:17 UTCEG score recompute
  50. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  51. 2026-08-02 15:22 UTCEG score recompute
  52. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  53. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  54. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  55. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  56. 2026-07-27 14:13 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  57. 2026-07-25 14:18 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  58. 2026-07-24 14:17 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  59. 2026-07-23 14:18 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  60. 2026-07-23 03:09 UTCEG score recompute
  61. 2026-07-22 14:08 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  62. 2026-07-21 15:24 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  63. 2026-07-20 17:08 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  64. 2026-07-19 14:31 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  65. 2026-07-18 10:04 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  66. 2026-07-17 05:24 UTCOSV refresh
  67. 2026-07-16 17:03 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  68. 2026-07-15 16:57 UTCEPSS rescoreEPSS 0.1% · 3rd percentile

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-33430?
CVE-2026-33430 is a high-severity vulnerability; its CVE record was published on March 26, 2026. Briefcase is a tool for converting a Python project into a standalone native application. Starting in version 0.3.0 and prior to version 0.3.26, if a developer uses Briefcase to produce an Windows MSI installer for a project, and that project is installed for All Users (i.e., per-machine scope),…
When was the CVE record for CVE-2026-33430 published?
The CVE record for CVE-2026-33430 was published on March 26, 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 June 17, 2026; the record at its source may have been updated since.
Is CVE-2026-33430 actively exploited?
CVE-2026-33430 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (3rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-33430?
CVE-2026-33430 has a CVSS v3 base score of 7.3 (NVD).
How do I remediate CVE-2026-33430?
A fix for CVE-2026-33430 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-33430 are linked in the Vendor Advisories panel on this page.

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