CVE-2026-73537

MEDIUMPre-NVD 4.74.7
EchelonGraph scoreMEDIUM confidence

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

Score 4.7 from GitHub Security Advisory published 2026-08-21. A secondary CVSS source baseline 4.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this week
4.7EG
EchelonGraph verdictMonitorRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 4.7Exploit: None knownExposed services: Not assessed

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

The CVE record's CNA (JPCERT/CC) lists Japan Science and Technology Agency (JST) Miraikan Assist App Android version versions before 1.1.7; Japan Science and Technology Agency (JST) Miraikan Assist App iOS version versions before 1.0.7 as affected. No release containing a fix is confirmed on record.

Cross-site scripting vulnerability exists in Miraikan Assist App. If this vulnerability is exploited, an arbitrary script may be executed in the browser component (WebView) running on the affected product, resulting in the displayed content being altered.

CVSS v3
4.7
EG Score
4.7MEDIUMmedium confidence
EG Risk
36
EG Risk 36/100

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)
Severity47% × 45%
The EG Score, 4.7 of 10.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (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: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.3%
EPSS %ILE
19th
KEV
Not listed

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

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (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; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (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

August 21, 2026

Last Modified

August 28, 2026

Advisory Details (2)

Auto-updated Aug 21, 2026
No fix on record yet.
Web page

JVN#09266484: Miraikan Assist App vulnerable to cross-site scripting

https://jvn.jp/en/jp/JVN09266484/
Web page

Update: Miraikan Assist App | Miraikan – The National Museum of Emerging Science and Innovation

https://www.miraikan.jst.go.jp/en/news/general/202608194709.html

Vendor Advisories for CVE-2026-73537(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 72× 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 138 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 38 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  3. 2026-10-12 15:40 UTCEG score recompute
  4. 2026-10-11 19:26 UTCEG score recompute
  5. 2026-10-11 16:42 UTCEG score recompute
  6. 2026-10-11 14:01 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  10. 2026-10-09 08:03 UTCEG score recompute
  11. 2026-10-09 08:03 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  12. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  13. 2026-10-08 05:58 UTCEG score recompute
  14. 2026-10-08 05:57 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  15. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  16. 2026-10-07 04:32 UTCEG score recompute
  17. 2026-10-07 04:32 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  18. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  19. 2026-10-06 03:06 UTCEG score recompute
  20. 2026-10-06 03:06 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  21. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  22. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  23. 2026-10-04 20:49 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  24. 2026-10-03 16:43 UTCEG score recompute
  25. 2026-10-03 16:43 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
Show 75 more
  1. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  2. 2026-10-02 11:04 UTCEG score recompute
  3. 2026-10-02 11:04 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  4. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  5. 2026-10-01 09:24 UTCEG score recompute
  6. 2026-10-01 09:24 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  7. 2026-09-30 08:00 UTCEG score recompute
  8. 2026-09-30 07:59 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  9. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  10. 2026-09-29 05:33 UTCEG score recompute
  11. 2026-09-29 05:33 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  12. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  13. 2026-09-28 04:07 UTCEG score recompute
  14. 2026-09-28 04:07 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  15. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  16. 2026-09-27 02:42 UTCEG score recompute
  17. 2026-09-27 02:42 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  18. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  19. 2026-09-25 07:36 UTCEG score recompute
  20. 2026-09-25 07:36 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  21. 2026-09-24 06:11 UTCEG score recompute
  22. 2026-09-24 06:11 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  23. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  24. 2026-09-23 04:46 UTCEG score recompute
  25. 2026-09-23 04:46 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  26. 2026-09-22 03:21 UTCEG score recompute
  27. 2026-09-22 03:21 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  28. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  29. 2026-09-21 01:55 UTCEG score recompute
  30. 2026-09-21 01:55 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  31. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  32. 2026-09-20 00:30 UTCEG score recompute
  33. 2026-09-20 00:30 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  34. 2026-09-18 23:04 UTCEG score recompute
  35. 2026-09-18 23:04 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  36. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  37. 2026-09-17 21:38 UTCEG score recompute
  38. 2026-09-17 21:38 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  39. 2026-09-16 20:13 UTCEG score recompute
  40. 2026-09-16 20:13 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  41. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  42. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  43. 2026-09-15 18:47 UTCEG score recompute
  44. 2026-09-15 18:47 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  45. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  46. 2026-09-14 16:23 UTCEG score recompute
  47. 2026-09-14 16:23 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  48. 2026-09-13 14:58 UTCEG score recompute
  49. 2026-09-13 14:58 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  50. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  51. 2026-09-12 13:33 UTCEG score recompute
  52. 2026-09-12 13:33 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  53. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  54. 2026-09-11 12:07 UTCEG score recompute
  55. 2026-09-11 12:07 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  56. 2026-09-10 09:47 UTCEG score recompute
  57. 2026-09-10 09:47 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  58. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  59. 2026-09-09 08:21 UTCEG score recompute
  60. 2026-09-09 08:21 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  61. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  62. 2026-09-08 06:57 UTCEG score recompute
  63. 2026-09-08 06:56 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  64. 2026-09-07 05:29 UTCEG score recompute
  65. 2026-09-07 05:29 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  66. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  67. 2026-09-06 04:02 UTCEG score recompute
  68. 2026-09-06 04:02 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  69. 2026-09-05 02:37 UTCEG score recompute
  70. 2026-09-05 02:36 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  71. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  72. 2026-09-04 01:07 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  73. 2026-09-02 23:41 UTCEG score recompute
  74. 2026-09-02 23:41 UTCGHSA enrichmentGHSA-599w-xgxp-wr28 · GitHub CVSS 4.7
  75. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 8th percentile

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Frequently asked(5)

What is CVE-2026-73537?
CVE-2026-73537 is a medium-severity vulnerability; its CVE record was published on August 21, 2026. Cross-site scripting vulnerability exists in Miraikan Assist App. If this vulnerability is exploited, an arbitrary script may be executed in the browser component (WebView) running on the affected product, resulting in the displayed content being altered.
When was the CVE record for CVE-2026-73537 published?
The CVE record for CVE-2026-73537 was published on August 21, 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 August 28, 2026; the record at its source may have been updated since.
Is CVE-2026-73537 actively exploited?
CVE-2026-73537 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (19th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73537?
CVE-2026-73537 has a CVSS base score of 4.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-73537?
No fix for CVE-2026-73537 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The CVE record's CNA (JPCERT/CC) lists Japan Science and Technology Agency (JST) Miraikan Assist App Android version versions before 1.1.7; Japan Science and Technology Agency (JST) Miraikan Assist App iOS version versions before 1.0.7 as affected. No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-73537 are linked in the Vendor Advisories panel on this page.

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