CVE-2026-6403

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-05-15. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0

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

The Quick Playground plugin for WordPress is vulnerable to Path Traversal in versions up to and including 1.3.3. This is due to insufficient path validation in the qckply_zip_theme() function, which appends a user-controlled 'stylesheet' parameter directly to the theme root directory path without sanitizing directory traversal sequences. This makes it possible for unauthenticated attackers to trigger the creation of a ZIP archive containing arbitrary files from the server's filesystem — including wp-config.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
52.8%
KEV
Not listed

Published

May 15, 2026

Last Modified

May 15, 2026

References (11)

Vendor Advisories for CVE-2026-6403(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 11× in last 7d / 65× 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 160 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-6403?
CVE-2026-6403 is a high vulnerability published on May 15, 2026. The Quick Playground plugin for WordPress is vulnerable to Path Traversal in versions up to and including 1.3.3. This is due to insufficient path validation in the qckplyziptheme() function, which appends a user-controlled 'stylesheet' parameter directly to the theme root directory path without…
When was CVE-2026-6403 disclosed?
CVE-2026-6403 was first published in the National Vulnerability Database on May 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6403 actively exploited?
CVE-2026-6403 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 52.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-6403?
CVE-2026-6403 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-6403?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6403, 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.

Dependency Blast Radius

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