CVE-2026-56843

CRITICALPre-NVD 9.99.9—
EchelonGraph scoreHIGH confidence

Score 9.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-08. a secondary CVSS source baseline 9.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.9
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.9Exploit: NoneExposed: 0

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

Incorrect authorization in the XML-RPC API of WebPros Plesk before 18.0.78.4 allows a low-privileged authenticated customer to look up domains they do not own, because ownership is enforced only for certain lookup filters and schema validation is bypassed for legacy protocol versions. This results in cross-tenant disclosure of other tenants' FTP credentials stored in cleartext, which can be leveraged to execute code as another tenant's system user.

CVSS v3
9.9
EG Score
9.9(high)
EPSS
25.6%
KEV
Not listed

Published

July 8, 2026

Last Modified

July 10, 2026

References (1)

Vendor Advisories for CVE-2026-56843(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 69× in last 7d / 69× 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. 2026-07-13 05:24 UTCEG score recompute
  2. 2026-07-13 05:24 UTCGHSA enrichment
  3. 2026-07-13 01:14 UTCEG score recompute
  4. 2026-07-13 01:14 UTCGHSA enrichment
  5. 2026-07-12 21:06 UTCEG score recompute
  6. 2026-07-12 21:06 UTCGHSA enrichment
  7. 2026-07-12 16:55 UTCEG score recompute
  8. 2026-07-12 16:55 UTCGHSA enrichment
  9. 2026-07-12 12:44 UTCEG score recompute
  10. 2026-07-12 12:44 UTCGHSA enrichment
  11. 2026-07-12 08:36 UTCEG score recompute
  12. 2026-07-12 08:36 UTCGHSA enrichment
  13. 2026-07-12 05:46 UTCEPSS rescore
  14. 2026-07-12 04:28 UTCEG score recompute
  15. 2026-07-12 04:28 UTCGHSA enrichment
  16. 2026-07-12 00:18 UTCEG score recompute
  17. 2026-07-12 00:18 UTCGHSA enrichment
  18. 2026-07-11 20:10 UTCEG score recompute
  19. 2026-07-11 20:10 UTCGHSA enrichment
  20. 2026-07-11 16:02 UTCEG score recompute
  21. 2026-07-11 16:02 UTCGHSA enrichment
  22. 2026-07-11 11:53 UTCEG score recompute
  23. 2026-07-11 11:53 UTCGHSA enrichment
  24. 2026-07-11 08:27 UTCEPSS rescore
  25. 2026-07-11 08:27 UTCEPSS rescore
Show 44 more
  1. 2026-07-11 07:44 UTCEG score recompute
  2. 2026-07-11 07:44 UTCGHSA enrichment
  3. 2026-07-11 03:36 UTCEG score recompute
  4. 2026-07-11 03:36 UTCGHSA enrichment
  5. 2026-07-10 23:28 UTCEG score recompute
  6. 2026-07-10 23:28 UTCGHSA enrichment
  7. 2026-07-10 19:19 UTCEG score recompute
  8. 2026-07-10 19:19 UTCGHSA enrichment
  9. 2026-07-10 15:11 UTCEG score recompute
  10. 2026-07-10 15:10 UTCGHSA enrichment
  11. 2026-07-10 11:01 UTCEG score recompute
  12. 2026-07-10 11:01 UTCGHSA enrichment
  13. 2026-07-10 06:52 UTCEG score recompute
  14. 2026-07-10 06:52 UTCGHSA enrichment
  15. 2026-07-10 02:43 UTCEG score recompute
  16. 2026-07-10 02:43 UTCGHSA enrichment
  17. 2026-07-09 22:35 UTCEG score recompute
  18. 2026-07-09 22:34 UTCGHSA enrichment
  19. 2026-07-09 19:10 UTCEPSS rescore
  20. 2026-07-09 19:10 UTCEPSS rescore
  21. 2026-07-09 18:26 UTCEG score recompute
  22. 2026-07-09 18:26 UTCGHSA enrichment
  23. 2026-07-09 14:16 UTCEG score recompute
  24. 2026-07-09 14:16 UTCGHSA enrichment
  25. 2026-07-09 10:08 UTCEG score recompute
  26. 2026-07-09 10:07 UTCGHSA enrichment
  27. 2026-07-09 05:58 UTCEG score recompute
  28. 2026-07-09 05:58 UTCGHSA enrichment
  29. 2026-07-09 01:48 UTCEG score recompute
  30. 2026-07-09 01:47 UTCGHSA enrichment
  31. 2026-07-08 21:39 UTCEG score recompute
  32. 2026-07-08 21:39 UTCGHSA enrichment
  33. 2026-07-08 17:31 UTCEG score recompute
  34. 2026-07-08 17:31 UTCGHSA enrichment
  35. 2026-07-08 15:16 UTCEPSS rescore
  36. 2026-07-08 15:16 UTCEPSS rescore
  37. 2026-07-08 13:22 UTCEG score recompute
  38. 2026-07-08 13:22 UTCGHSA enrichment
  39. 2026-07-08 09:14 UTCEG score recompute
  40. 2026-07-08 09:14 UTCGHSA enrichment
  41. 2026-07-08 05:06 UTCEG score recompute
  42. 2026-07-08 05:06 UTCGHSA enrichment
  43. 2026-07-08 00:55 UTCEG score recompute
  44. 2026-07-08 00:55 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-56843?
CVE-2026-56843 is a critical vulnerability published on July 8, 2026. Incorrect authorization in the XML-RPC API of WebPros Plesk before 18.0.78.4 allows a low-privileged authenticated customer to look up domains they do not own, because ownership is enforced only for certain lookup filters and schema validation is bypassed for legacy protocol versions. This results…
When was CVE-2026-56843 disclosed?
CVE-2026-56843 was first published in the National Vulnerability Database on July 8, 2026, with the most recent update on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56843 actively exploited?
CVE-2026-56843 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 25.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-56843?
CVE-2026-56843 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2026-56843?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56843, 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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