CVE-2026-8423

MEDIUMNVD 4.34.3—
EchelonGraph scoreMEDIUM confidence

Score 4.3 from GitHub Security Advisory published 2026-05-20. NVD baseline CVSS 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
4.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.3Exploit: NoneExposed: 0

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

The JaviBola Custom Theme Test plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.0.5. This is due to missing or incorrect nonce validation on the options page. This makes it possible for unauthenticated attackers to change the site's active theme by modifying the jbct_theme option via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

CVSS v3
4.3
EG Score
4.3(medium)
EPSS
7.6%
KEV
Not listed

Published

May 20, 2026

Last Modified

May 20, 2026

References (7)

Vendor Advisories for CVE-2026-8423(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 / 44× 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. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 02:00 UTCEPSS rescore
  3. 2026-07-13 22:31 UTCEPSS rescore
  4. 2026-07-13 06:13 UTCEPSS rescore
  5. 2026-07-12 05:46 UTCEPSS rescore
  6. 2026-07-11 08:27 UTCEPSS rescore
  7. 2026-07-09 19:10 UTCEPSS rescore
  8. 2026-07-08 15:16 UTCEPSS rescore
  9. 2026-07-07 13:46 UTCEPSS rescore
  10. 2026-07-07 13:46 UTCEPSS rescore
  11. 2026-07-06 02:23 UTCEPSS rescore
  12. 2026-07-06 02:23 UTCEPSS rescore
  13. 2026-07-05 02:31 UTCEPSS rescore
  14. 2026-07-05 02:30 UTCEPSS rescore
  15. 2026-07-04 06:31 UTCEPSS rescore
  16. 2026-07-04 06:31 UTCEPSS rescore
  17. 2026-07-01 15:07 UTCEPSS rescore
  18. 2026-06-30 23:22 UTCEPSS rescore
  19. 2026-06-29 20:32 UTCEG score recompute
  20. 2026-06-29 20:32 UTCGHSA enrichment
  21. 2026-06-29 14:06 UTCEPSS rescore
  22. 2026-06-28 14:07 UTCEPSS rescore
  23. 2026-06-28 04:56 UTCEPSS rescore
  24. 2026-06-27 22:06 UTCEG score recompute
  25. 2026-06-27 22:06 UTCGHSA enrichment
Show 75 more
  1. 2026-06-27 03:08 UTCEPSS rescore
  2. 2026-06-26 19:40 UTCEG score recompute
  3. 2026-06-26 19:40 UTCGHSA enrichment
  4. 2026-06-25 16:23 UTCEG score recompute
  5. 2026-06-25 16:23 UTCGHSA enrichment
  6. 2026-06-25 13:50 UTCEPSS rescore
  7. 2026-06-24 14:05 UTCEPSS rescore
  8. 2026-06-23 21:33 UTCEPSS rescore
  9. 2026-06-22 14:25 UTCEPSS rescore
  10. 2026-06-21 14:56 UTCEPSS rescore
  11. 2026-06-21 01:59 UTCEPSS rescore
  12. 2026-06-19 19:26 UTCEPSS rescore
  13. 2026-06-18 17:52 UTCEPSS rescore
  14. 2026-06-17 22:42 UTCEG score recompute
  15. 2026-06-17 22:42 UTCGHSA enrichment
  16. 2026-06-17 17:53 UTCEPSS rescore
  17. 2026-06-16 20:19 UTCEG score recompute
  18. 2026-06-16 20:19 UTCGHSA enrichment
  19. 2026-06-16 17:53 UTCEPSS rescore
  20. 2026-06-15 17:49 UTCEPSS rescore
  21. 2026-06-15 17:49 UTCEPSS rescore
  22. 2026-06-15 15:53 UTCEG score recompute
  23. 2026-06-15 15:52 UTCGHSA enrichment
  24. 2026-06-14 23:18 UTCEPSS rescore
  25. 2026-06-14 07:13 UTCEG score recompute
  26. 2026-06-14 07:13 UTCGHSA enrichment
  27. 2026-06-13 23:00 UTCEPSS rescore
  28. 2026-06-13 04:52 UTCEG score recompute
  29. 2026-06-13 04:52 UTCGHSA enrichment
  30. 2026-06-12 23:12 UTCEPSS rescore
  31. 2026-06-12 23:12 UTCEPSS rescore
  32. 2026-06-12 02:31 UTCEG score recompute
  33. 2026-06-12 02:31 UTCGHSA enrichment
  34. 2026-06-11 14:00 UTCEPSS rescore
  35. 2026-06-11 00:10 UTCEG score recompute
  36. 2026-06-11 00:10 UTCGHSA enrichment
  37. 2026-06-10 22:19 UTCEPSS rescore
  38. 2026-06-10 13:22 UTCEPSS rescore
  39. 2026-06-09 21:50 UTCEG score recompute
  40. 2026-06-09 21:50 UTCGHSA enrichment
  41. 2026-06-08 19:29 UTCEG score recompute
  42. 2026-06-08 19:29 UTCGHSA enrichment
  43. 2026-06-08 14:17 UTCEPSS rescore
  44. 2026-06-07 17:06 UTCEG score recompute
  45. 2026-06-07 17:06 UTCGHSA enrichment
  46. 2026-06-07 15:25 UTCEPSS rescore
  47. 2026-06-06 14:45 UTCEG score recompute
  48. 2026-06-06 14:45 UTCGHSA enrichment
  49. 2026-06-06 13:47 UTCEPSS rescore
  50. 2026-06-05 22:47 UTCEPSS rescore
  51. 2026-06-05 12:24 UTCEG score recompute
  52. 2026-06-05 12:24 UTCGHSA enrichment
  53. 2026-06-04 13:12 UTCEPSS rescore
  54. 2026-06-04 10:03 UTCEG score recompute
  55. 2026-06-04 10:03 UTCGHSA enrichment
  56. 2026-06-03 07:42 UTCEG score recompute
  57. 2026-06-03 07:42 UTCGHSA enrichment
  58. 2026-06-02 20:13 UTCEPSS rescore
  59. 2026-06-02 05:21 UTCEG score recompute
  60. 2026-06-02 05:21 UTCGHSA enrichment
  61. 2026-06-01 13:52 UTCEPSS rescore
  62. 2026-06-01 03:00 UTCEG score recompute
  63. 2026-06-01 03:00 UTCGHSA enrichment
  64. 2026-05-31 22:30 UTCEPSS rescore
  65. 2026-05-31 00:16 UTCEPSS rescore
  66. 2026-05-29 13:44 UTCEPSS rescore
  67. 2026-05-28 13:44 UTCEPSS rescore
  68. 2026-05-27 13:40 UTCEPSS rescore
  69. 2026-05-27 13:40 UTCEPSS rescore
  70. 2026-05-26 13:44 UTCEPSS rescore
  71. 2026-05-26 07:18 UTCEPSS rescore
  72. 2026-05-21 22:43 UTCEPSS rescore
  73. 2026-05-20 22:38 UTCEPSS rescore
  74. 2026-05-20 11:36 UTCEG score recompute
  75. 2026-05-20 11:36 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-8423?
CVE-2026-8423 is a medium vulnerability published on May 20, 2026. The JaviBola Custom Theme Test plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.0.5. This is due to missing or incorrect nonce validation on the options page. This makes it possible for unauthenticated attackers to change the site's active…
When was CVE-2026-8423 disclosed?
CVE-2026-8423 was first published in the National Vulnerability Database on May 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8423 actively exploited?
CVE-2026-8423 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 7.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8423?
CVE-2026-8423 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-8423?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8423, 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.

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