CVE-2026-45313

HIGHPre-NVD 7.77.7
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 7.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (3rd 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
7.7EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines 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: 0.2%CVSS: 7.7Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Sandboxie-Plus is an open source sandbox-based isolation software for Windows. Prior to 1.17.6, GuiServer::WndHookRegisterSlave in Sandboxie/core/svc/GuiServer.cpp stores attacker-supplied hthread and hproc fields from a GUI_WND_HOOK_REGISTER request without validating that the thread belongs to the sandboxed process or that the function pointer is in the caller address space, and GuiServer::WndHookNotifySlave then calls OpenThread(THREAD_SET_CONTEXT, FALSE, whk->hthread) and QueueUserAPC((PAPCFUNC)whk->hproc, hThread, (ULONG_PTR)req->threadid) as SYSTEM, allowing a sandboxed process to execute arbitrary code in an unsandboxed host process. This issue is fixed in version 1.17.6.

CVSS v3
7.7
EG Score
7.7HIGHmedium confidence
EG Risk
51
EG Risk 51/100

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)
Severity77% × 45%
The EG Score, 7.7 of 10.
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: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.2%
EPSS %ILE
3rd
KEV
Not listed

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

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

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

July 15, 2026

Last Modified

July 16, 2026

Advisory Details (2)

Auto-updated Jul 15, 2026
Patch available. Sources: github_release, github.
GitHub advisoryMentions a patch (unverified)

Sandboxie APC Injection Sandbox Escape · Advisory · sandboxie-plus/Sandboxie · GitHub

https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-rmv3-fhg3-75xh
GitHub release Patch Available

Release v1.17.6 / 5.72.6

Patch available: sandboxie-plus/Sandboxie v1.17.6

https://github.com/sandboxie-plus/Sandboxie/releases/tag/v1.17.6

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 29× 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 100 of 112 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. None are among the latest 100 rows. The 12 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 3rd percentile
  2. 2026-10-12 16:04 UTCEG score recompute
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  6. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.2% · 3rd percentile
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  10. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 3rd percentile
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  13. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 3rd percentile
  14. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.2% · 3rd percentile
  15. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 3rd percentile
  16. 2026-10-01 12:35 UTCEG score recompute
  17. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 3rd percentile
  18. 2026-09-28 08:41 UTCEG score recompute
  19. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 3rd percentile
  20. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.2% · 3rd percentile
  21. 2026-09-24 08:45 UTCEG score recompute
  22. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.2% · 4th percentile
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  24. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  25. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 4th percentile
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  1. 2026-09-18 04:42 UTCEG score recompute
  2. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  3. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  4. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  5. 2026-09-13 23:11 UTCEG score recompute
  6. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  7. 2026-09-13 07:11 UTCEG score recompute
  8. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  9. 2026-09-11 21:43 UTCEG score recompute
  10. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  11. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  12. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  13. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  14. 2026-09-08 00:41 UTCEG score recompute
  15. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  16. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  17. 2026-09-05 20:45 UTCEG score recompute
  18. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 4th percentile
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  20. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  21. 2026-08-31 05:55 UTCEG score recompute
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  23. 2026-08-30 03:44 UTCEG score recompute
  24. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  25. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  26. 2026-08-27 21:27 UTCEG score recompute
  27. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  28. 2026-08-26 14:57 UTCEG score recompute
  29. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  30. 2026-08-26 01:39 UTCEG score recompute
  31. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  32. 2026-08-24 23:28 UTCEG score recompute
  33. 2026-08-24 10:23 UTCEG score recompute
  34. 2026-08-23 08:12 UTCEG score recompute
  35. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  36. 2026-08-22 06:01 UTCEG score recompute
  37. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.1% · 1st percentile
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  40. 2026-08-20 00:07 UTCEG score recompute
  41. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  42. 2026-08-18 02:32 UTCEG score recompute
  43. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  44. 2026-08-16 22:38 UTCEG score recompute
  45. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.1% · 1st percentile
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  47. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.1% · 1st percentile
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  49. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.1% · 1st percentile
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  51. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  52. 2026-08-13 01:48 UTCEG score recompute
  53. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  54. 2026-08-11 23:30 UTCEG score recompute
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  56. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  57. 2026-08-09 19:09 UTCEG score recompute
  58. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.1% · 1st percentile
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  60. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  61. 2026-08-08 03:54 UTCEG score recompute
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  63. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
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  70. 2026-08-01 14:19 UTCEG score recompute
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  72. 2026-07-30 22:58 UTCEG score recompute
  73. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.1% · 1st percentile
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  75. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.1% · 1st percentile

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Frequently asked(5)

What is CVE-2026-45313?
CVE-2026-45313 is a high-severity vulnerability; its CVE record was published on July 15, 2026. Sandboxie-Plus is an open source sandbox-based isolation software for Windows. Prior to 1.17.6, GuiServer::WndHookRegisterSlave in Sandboxie/core/svc/GuiServer.cpp stores attacker-supplied hthread and hproc fields from a GUIWNDHOOKREGISTER request without validating that the thread belongs to the…
When was the CVE record for CVE-2026-45313 published?
The CVE record for CVE-2026-45313 was published on July 15, 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 16, 2026; the record at its source may have been updated since.
Is CVE-2026-45313 actively exploited?
CVE-2026-45313 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (3rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-45313?
CVE-2026-45313 has a CVSS base score of 7.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-45313?
A fix for CVE-2026-45313 is available: update to the fixed version the vendor names in its advisory.

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