CVE-2026-65556

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-06. 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.

Unauthenticated PHP Object Injection in WPBruiser {no- Captcha anti-Spam} <= 3.1.43 versions.

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
23%
KEV
Not listed

Published

August 6, 2026

Last Modified

August 12, 2026

Advisory Details (1)

Auto-updated Sep 16, 2026
Patch available.
generic Patch Available

PHP Object Injection in WordPress WPBruiser {no- Captcha anti-Spam} Plugin - Patchstack

https://patchstack.com/database/wordpress/plugin/goodbye-captcha/vulnerability/wordpress-wpbruiser-no-captcha-anti-spam-plugin-3-1-43-php-object-injection-vulnerability?_s_id=cve

Vendor Advisories for CVE-2026-65556(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 38× in last 7d / 174× 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 296 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-65556?
CVE-2026-65556 is a critical vulnerability published on August 6, 2026. Unauthenticated PHP Object Injection in WPBruiser {no- Captcha anti-Spam} <= 3.1.43 versions.
When was CVE-2026-65556 disclosed?
CVE-2026-65556 was first published in the National Vulnerability Database on August 6, 2026, with the most recent update on August 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-65556 actively exploited?
CVE-2026-65556 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 76.6% of all scored CVEs.
What is the CVSS score of CVE-2026-65556?
CVE-2026-65556 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-65556?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-65556, 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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