CVE-2026-6279

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-21. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

The Avada Builder (fusion-builder) plugin for WordPress is vulnerable to Unauthenticated Remote Code Execution via PHP Function Injection in versions up to and including 3.15.2. This is due to the wp_conditional_tags case in Fusion_Builder_Conditional_Render_Helper::get_value() passing attacker-controlled values from a base64-decoded JSON blob directly to call_user_func() without any allowlist validation. This is exploitable by unauthenticated attackers through the fusion_get_widget_markup AJAX endpoint, which is registered for non-privileged (unauthenticated) users via wp_ajax_nopriv_fusion_get_widget_markup. The endpoint is protected only by a nonce (fusion_load_nonce), but this nonce is generated for user ID 0 and is deterministically exposed in the JavaScript output of any public-facing page containing a Post Cards ([fusion_post_cards]) or Table of Contents ([fusion_table_of_contents]) element. This makes it possible for unauthenticated attackers to execute arbitrary code on affected sites.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Track)
EG Risk 75/100SSVC: 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%
Exploitation40% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
81%
KEV
Not listed

Published

May 21, 2026

Last Modified

July 23, 2026

Advisory Details (1)

Auto-updated Aug 29, 2026
No patch confirmed yet.
generic

Avada Changelog – Avada Website Builder

https://avada.com/documentation/avada-changelog/

Vendor Advisories for CVE-2026-6279(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 5× in last 7d / 111× 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 318 total refreshes for this CVE.

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

Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoC87achrafg-stack/CVE-2026-6279.py
    First seen Jun 13, 2026

    CVE-2026-6279

    Open source ↗
  • GitHub PoCzycoder0day/CVE-2026-6279
    First seen May 23, 2026

    CVE-2026-6279 — Avada Builder <= 3.15.2 Unauthenticated RCE via call_user_func()

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-6279?
CVE-2026-6279 is a critical vulnerability published on May 21, 2026. The Avada Builder (fusion-builder) plugin for WordPress is vulnerable to Unauthenticated Remote Code Execution via PHP Function Injection in versions up to and including 3.15.2. This is due to the wpconditionaltags case in FusionBuilderConditionalRenderHelper::getvalue() passing attacker-controlled…
When was CVE-2026-6279 disclosed?
CVE-2026-6279 was first published in the National Vulnerability Database on May 21, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6279 actively exploited?
CVE-2026-6279 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 19.1% of all scored CVEs.
What is the CVSS score of CVE-2026-6279?
CVE-2026-6279 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-6279?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6279, 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-2026-6279

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