CVE-2026-16774

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-07-28. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

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

The Chatbot plugin for WordPress is vulnerable to Missing Authorization in versions up to, and including, 8.5.9 via the wpcs_send_email() AJAX handler. This is due to the wpcs_send_email() function being registered on both wp_ajax_wpcs_send_email and wp_ajax_nopriv_wpcs_send_email with no nonce verification, capability check, or rate limiting, while forwarding attacker-controlled recipient, subject, and body directly to wp_mail(). This makes it possible for unauthenticated attackers to send arbitrary emails to any recipient from the site's domain, enabling spam, phishing, and abuse that can lead to the site's IP/domain being blacklisted.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
14%
KEV
Not listed

Published

July 28, 2026

Last Modified

July 28, 2026

References (5)

Vendor Advisories for CVE-2026-16774(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 18× in last 7d / 69× 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 128 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-16774?
CVE-2026-16774 is a medium vulnerability published on July 28, 2026. The Chatbot plugin for WordPress is vulnerable to Missing Authorization in versions up to, and including, 8.5.9 via the wpcssendemail() AJAX handler. This is due to the wpcssendemail() function being registered on both wpajaxwpcssendemail and wpajaxnoprivwpcssendemail with no nonce verification,…
When was CVE-2026-16774 disclosed?
CVE-2026-16774 was first published in the National Vulnerability Database on July 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-16774 actively exploited?
CVE-2026-16774 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 85.5% of all scored CVEs.
What is the CVSS score of CVE-2026-16774?
CVE-2026-16774 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-16774?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16774, 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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