CVE-2026-8499

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-06-09. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 5.3Exploit: None knownExposed services: Not assessed

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

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
5.3MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100

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
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
EPSS PROB
0.5%
EPSS %ILE
38th
KEV
Not listed

Published

June 9, 2026

Last Modified

July 23, 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 7× in last 7d / 28× 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 218 total refreshes for this CVE.

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

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 on June 9, 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-2026-8499 actively exploited?
CVE-2026-8499 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (38th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-8499?
CVE-2026-8499 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-8499?
No fix for CVE-2026-8499 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-8499 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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