CVE-2026-8499

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-06-09. the CNA's CVSS baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:wordfence, epss, ghsa
Trending — 3 sources updated this week
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.3Exploit: NoneExposed: 0

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

The Helpfulcrowd Product Reviews plugin for WordPress is vulnerable to Authorization Bypass via PHP Type Juggling in versions up to, and including, 1.2.9. This is due to the helpfulcrowd_validate_token() function using a loose comparison operator (!=) instead of a strict comparison (!==) when validating the token parameter, while the corresponding REST route /wp-json/helpfulcrowd/v1/update-settings is registered with a permission_callback of __return_true, making it reachable by unauthenticated users; submitting a JSON boolean true as the token value causes PHP's loose comparison to evaluate as equal to the non-empty base64-encoded secret string, bypassing the check entirely. This makes it possible for unauthenticated attackers to invoke helpfulcrowd_settings_endpoint() and write arbitrary attacker-controlled key-value pairs directly into the helpfulcrowd_options WordPress database option via update_option() without any sanitization or allowlist filtering, enabling full unauthenticated modification of the plugin's stored configuration.

CVSS v3
5.3
EG Score
5.3(high)
EPSS
19.1%
KEV
Not listed

Published

June 9, 2026

Last Modified

June 9, 2026

References (4)

Vendor Advisories for CVE-2026-8499(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 22× in last 7d / 91× 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. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-06 02:23 UTCEPSS rescore
  4. 2026-07-06 02:23 UTCEPSS rescore
  5. 2026-07-05 15:57 UTCEG score recompute
  6. 2026-07-05 15:56 UTCGHSA enrichment
  7. 2026-07-05 02:31 UTCEPSS rescore
  8. 2026-07-05 02:30 UTCEPSS rescore
  9. 2026-07-04 14:33 UTCEG score recompute
  10. 2026-07-04 14:33 UTCGHSA enrichment
  11. 2026-07-04 06:31 UTCEPSS rescore
  12. 2026-07-04 06:31 UTCEPSS rescore
  13. 2026-07-03 09:47 UTCEG score recompute
  14. 2026-07-03 09:46 UTCGHSA enrichment
  15. 2026-07-02 12:01 UTCEG score recompute
  16. 2026-07-02 12:01 UTCGHSA enrichment
  17. 2026-07-01 15:07 UTCEPSS rescore
  18. 2026-07-01 14:04 UTCEG score recompute
  19. 2026-07-01 14:04 UTCGHSA enrichment
  20. 2026-06-30 23:22 UTCEPSS rescore
  21. 2026-06-30 16:19 UTCEG score recompute
  22. 2026-06-30 16:19 UTCGHSA enrichment
  23. 2026-06-29 14:06 UTCEPSS rescore
  24. 2026-06-29 12:28 UTCEG score recompute
  25. 2026-06-29 12:28 UTCGHSA enrichment
Show 66 more
  1. 2026-06-28 14:44 UTCEG score recompute
  2. 2026-06-28 14:44 UTCGHSA enrichment
  3. 2026-06-28 14:07 UTCEPSS rescore
  4. 2026-06-28 04:56 UTCEPSS rescore
  5. 2026-06-27 16:59 UTCEG score recompute
  6. 2026-06-27 16:58 UTCGHSA enrichment
  7. 2026-06-27 03:08 UTCEPSS rescore
  8. 2026-06-26 19:13 UTCEG score recompute
  9. 2026-06-26 19:13 UTCGHSA enrichment
  10. 2026-06-25 21:29 UTCEG score recompute
  11. 2026-06-25 21:29 UTCGHSA enrichment
  12. 2026-06-25 13:50 UTCEPSS rescore
  13. 2026-06-24 23:45 UTCEG score recompute
  14. 2026-06-24 23:45 UTCGHSA enrichment
  15. 2026-06-24 14:05 UTCEPSS rescore
  16. 2026-06-24 02:00 UTCEG score recompute
  17. 2026-06-24 01:59 UTCGHSA enrichment
  18. 2026-06-23 21:33 UTCEPSS rescore
  19. 2026-06-23 04:15 UTCEG score recompute
  20. 2026-06-23 04:15 UTCGHSA enrichment
  21. 2026-06-22 14:25 UTCEPSS rescore
  22. 2026-06-22 05:28 UTCEG score recompute
  23. 2026-06-22 05:27 UTCGHSA enrichment
  24. 2026-06-21 14:56 UTCEPSS rescore
  25. 2026-06-21 01:59 UTCEPSS rescore
  26. 2026-06-21 01:56 UTCEG score recompute
  27. 2026-06-21 01:56 UTCGHSA enrichment
  28. 2026-06-20 02:55 UTCEG score recompute
  29. 2026-06-20 02:54 UTCGHSA enrichment
  30. 2026-06-19 19:26 UTCEPSS rescore
  31. 2026-06-19 05:07 UTCEG score recompute
  32. 2026-06-19 05:07 UTCGHSA enrichment
  33. 2026-06-18 17:52 UTCEPSS rescore
  34. 2026-06-18 07:19 UTCEG score recompute
  35. 2026-06-18 07:19 UTCGHSA enrichment
  36. 2026-06-17 17:53 UTCEPSS rescore
  37. 2026-06-17 08:35 UTCEG score recompute
  38. 2026-06-17 08:35 UTCGHSA enrichment
  39. 2026-06-16 17:53 UTCEPSS rescore
  40. 2026-06-16 10:49 UTCEG score recompute
  41. 2026-06-16 10:49 UTCGHSA enrichment
  42. 2026-06-15 17:49 UTCEPSS rescore
  43. 2026-06-15 17:49 UTCEPSS rescore
  44. 2026-06-15 13:05 UTCEG score recompute
  45. 2026-06-15 13:05 UTCGHSA enrichment
  46. 2026-06-14 23:18 UTCEPSS rescore
  47. 2026-06-14 15:21 UTCEG score recompute
  48. 2026-06-14 15:21 UTCGHSA enrichment
  49. 2026-06-13 23:00 UTCEPSS rescore
  50. 2026-06-13 17:37 UTCEG score recompute
  51. 2026-06-13 17:37 UTCGHSA enrichment
  52. 2026-06-12 23:12 UTCEPSS rescore
  53. 2026-06-12 23:12 UTCEPSS rescore
  54. 2026-06-12 19:43 UTCEG score recompute
  55. 2026-06-12 19:43 UTCGHSA enrichment
  56. 2026-06-11 21:59 UTCEG score recompute
  57. 2026-06-11 21:59 UTCGHSA enrichment
  58. 2026-06-11 14:00 UTCEPSS rescore
  59. 2026-06-11 00:15 UTCEG score recompute
  60. 2026-06-11 00:15 UTCGHSA enrichment
  61. 2026-06-10 22:19 UTCEPSS rescore
  62. 2026-06-10 13:22 UTCEPSS rescore
  63. 2026-06-10 02:31 UTCEG score recompute
  64. 2026-06-10 02:31 UTCGHSA enrichment
  65. 2026-06-09 04:48 UTCEG score recompute
  66. 2026-06-09 04:45 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-8499?
CVE-2026-8499 is a medium vulnerability published on June 9, 2026. The Helpfulcrowd Product Reviews plugin for WordPress is vulnerable to Authorization Bypass via PHP Type Juggling in versions up to, and including, 1.2.9. This is due to the helpfulcrowdvalidatetoken() function using a loose comparison operator (!=) instead of a strict comparison (!==) when…
When was CVE-2026-8499 disclosed?
CVE-2026-8499 was first published in the National Vulnerability Database on June 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8499 actively exploited?
CVE-2026-8499 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 19.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8499?
CVE-2026-8499 has a CVSS v4.0 base score of 5.3 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-8499?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8499, 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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