CVE-2026-18315

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-19. 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: 1%CVSS: 9.8Exploit: None knownExposed: 0

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

The TrueBooker – Appointment Booking and Scheduler System plugin for WordPress is vulnerable to Authorization Bypass Through User-Controlled Key leading to Account Takeover in all versions up to, and including, 1.2.6. This is due to the admin_user_create_cus AJAX handler lacking any authentication or capability check before passing the attacker-supplied truebooker_wp_user_id parameter directly to wp_update_user. This makes it possible for unauthenticated attackers to overwrite the email address of any WordPress user — including an administrator — and then complete the standard WordPress lost-password flow to fully take over the targeted account.

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%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
47%
KEV
Not listed

Published

August 19, 2026

Last Modified

August 21, 2026

Advisory Details (3)

Auto-updated Sep 18, 2026
No patch confirmed yet.
generic
https://plugins.svn.wordpress.org/truebooker-appointment-booking/tags/1.2.6/templates/login-register.php
generic
https://plugins.svn.wordpress.org/truebooker-appointment-booking/tags/1.2.6/main/function_ajax.php
generic
https://plugins.svn.wordpress.org/truebooker-appointment-booking/tags/1.2.6/main/config/truebooker-style.php

Vendor Advisories for CVE-2026-18315(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 47× in last 7d / 217× 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 240 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18315?
CVE-2026-18315 is a critical vulnerability published on August 19, 2026. The TrueBooker – Appointment Booking and Scheduler System plugin for WordPress is vulnerable to Authorization Bypass Through User-Controlled Key leading to Account Takeover in all versions up to, and including, 1.2.6. This is due to the adminusercreatecus AJAX handler lacking any authentication or…
When was CVE-2026-18315 disclosed?
CVE-2026-18315 was first published in the National Vulnerability Database on August 19, 2026, with the most recent update on August 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18315 actively exploited?
CVE-2026-18315 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 52.7% of all scored CVEs.
What is the CVSS score of CVE-2026-18315?
CVE-2026-18315 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-18315?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18315, 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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