CVE-2026-12323

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

Score 5.4 from GitHub Security Advisory published 2026-06-16. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.4Exploit: None knownExposed services: Not assessed

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

Spoofing issue in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 152 and Thunderbird 152.

CVSS v3
5.4
EG Score
5.4MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100

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
Severity54% × 45%
Exploitation0% × 40%
Automatability30% × 15%
EPSS PROB
0.2%
EPSS %ILE
5th
KEV
Not listed

Published

June 16, 2026

Last Modified

June 16, 2026

Advisory Details (2)

Auto-updated Jun 16, 2026
No fix on record yet.
generic

Security Vulnerabilities fixed in Firefox 152 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-57/
generic

Access Denied

https://bugzilla.mozilla.org/show_bug.cgi?id=2035027

Vendor Advisories for CVE-2026-12323(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 7× in last 7d / 23× 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 188 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-12323?
CVE-2026-12323 is a medium vulnerability published on June 16, 2026. Spoofing issue in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 152 and Thunderbird 152.
When was CVE-2026-12323 disclosed?
CVE-2026-12323 was first published on June 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12323 actively exploited?
CVE-2026-12323 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (5th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-12323?
CVE-2026-12323 has a CVSS v3.1 base score of 5.4 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-12323?
No fix for CVE-2026-12323 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 vendor advisories EchelonGraph has for CVE-2026-12323 are linked in the Vendor Advisories panel on this page.

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