CVE-2026-13439

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-21. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

The Easy Form Builder by WhiteStudio plugin for WordPress is vulnerable to Unauthenticated Privilege Escalation to Administrator in versions up to, and including, 4.0.11 This is due to the password recovery flow using the publicly-visible session identifier ('sid') as the password reset token stored in wp_emsfb_temp_links, combined with a publicly-accessible nonce refresh endpoint (Emsfb/v1/nonce/refresh) that issues valid WordPress REST nonces to unauthenticated visitors. This makes it possible for unauthenticated attackers to reset the password of any WordPress user — including administrators — by scraping the public sid from a published login form page, submitting a recovery request for any known user email via Emsfb/v1/forms/message/add, and then calling Emsfb/v1/forms/recovery/efb_set_password with the known sid to set an arbitrary new password and gain full administrator access.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
59(Track)
EG Risk 59/100SSVC: Track

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
Severity98% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
33%
KEV
Not listed

Published

July 21, 2026

Last Modified

July 21, 2026

References (8)

Vendor Advisories for CVE-2026-13439(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 34× in last 7d / 203× 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 255 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-13439?
CVE-2026-13439 is a critical vulnerability published on July 21, 2026. The Easy Form Builder by WhiteStudio plugin for WordPress is vulnerable to Unauthenticated Privilege Escalation to Administrator in versions up to, and including, 4.0.11 This is due to the password recovery flow using the publicly-visible session identifier ('sid') as the password reset token…
When was CVE-2026-13439 disclosed?
CVE-2026-13439 was first published in the National Vulnerability Database on July 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-13439 actively exploited?
CVE-2026-13439 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 66.9% of all scored CVEs.
What is the CVSS score of CVE-2026-13439?
CVE-2026-13439 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-13439?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-13439, 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

Explore the affected products and dependency analysis for CVE-2026-13439

Explore →

Is Your Infrastructure Affected by CVE-2026-13439?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs