CVE-2026-6555

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-20. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

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

The ProSolution WP Client plugin for WordPress is vulnerable to Arbitrary File Upload in versions up to, and including, 2.0.0. This is due to an array validation mismatch where only the first file in the upload array undergoes extension and MIME type validation, while all files are processed and uploaded to a web-accessible directory. This makes it possible for unauthenticated attackers to upload malicious PHP files and achieve remote code execution by sending a valid first file followed by a malicious file.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
58.1%
KEV
Not listed

Published

May 20, 2026

Last Modified

June 23, 2026

References (10)

Vendor Advisories for CVE-2026-6555(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 12× in last 7d / 92× 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 286 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-6555?
CVE-2026-6555 is a critical vulnerability published on May 20, 2026. The ProSolution WP Client plugin for WordPress is vulnerable to Arbitrary File Upload in versions up to, and including, 2.0.0. This is due to an array validation mismatch where only the first file in the upload array undergoes extension and MIME type validation, while all files are processed and…
When was CVE-2026-6555 disclosed?
CVE-2026-6555 was first published in the National Vulnerability Database on May 20, 2026, with the most recent update on June 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6555 actively exploited?
CVE-2026-6555 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 58.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-6555?
CVE-2026-6555 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-6555?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6555, 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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