CVE-2026-18779

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-08-19. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
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: 0.3%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 TrueBooker WordPress plugin before 1.2.7 does not have proper authorisation checks in one of its AJAX actions, allowing unauthenticated users to delete arbitrary appointment records along with their associated booking items and payment records.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.3%
EPSS %ILE
21st
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 19, 2026

Last Modified

August 26, 2026

Advisory Details (1)

Auto-updated Aug 19, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

TrueBooker Appointment Booking < 1.2.7 – Unauthenticated Appointment and Payment Record Deletion via update_appointment_booked | CVE 2026-18779 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/9d7f9a09-a144-4a0a-998c-e5bc5037fc1b/

Vendor Advisories for CVE-2026-18779(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 14× in last 7d / 70× 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 122 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-18779?
CVE-2026-18779 is a medium vulnerability published on August 19, 2026. The TrueBooker WordPress plugin before 1.2.7 does not have proper authorisation checks in one of its AJAX actions, allowing unauthenticated users to delete arbitrary appointment records along with their associated booking items and payment records.
When was CVE-2026-18779 disclosed?
CVE-2026-18779 was first published on August 19, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18779 actively exploited?
CVE-2026-18779 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (21st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18779?
CVE-2026-18779 has a CVSS v3.1 base score of 5.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-18779?
No fix for CVE-2026-18779 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-2026-18779 are linked in the Vendor Advisories panel on this page.

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