CVE-2026-12378

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-07-08. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.1Exploit: None knownExposed: 0

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

The Appointment Booking Calendar Plugin and Scheduling Plugin WordPress plugin through 1.1.28 does not validate data before passing it to a PHP deserialization function, allowing unauthenticated attackers to inject arbitrary PHP objects; where a suitable gadget chain is present on the site this can be leveraged to achieve remote code execution.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity81% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
48%
KEV
Not listed

Published

July 8, 2026

Last Modified

July 8, 2026

Advisory Details (1)

Auto-updated Jul 8, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

BookingPress <= 1.5.5 – Unauthenticated PHP Object Injection | CVE 2026-12378 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/eb3abb88-43c3-42a8-a8a8-2ad67d37e020/

Vendor Advisories for CVE-2026-12378(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

(refreshed 20× in last 7d / 105× 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 165 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-12378?
CVE-2026-12378 is a high vulnerability published on July 8, 2026. The Appointment Booking Calendar Plugin and Scheduling Plugin WordPress plugin through 1.1.28 does not validate data before passing it to a PHP deserialization function, allowing unauthenticated attackers to inject arbitrary PHP objects; where a suitable gadget chain is present on the site this can…
When was CVE-2026-12378 disclosed?
CVE-2026-12378 was first published in the National Vulnerability Database on July 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12378 actively exploited?
CVE-2026-12378 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 51.5% of all scored CVEs.
What is the CVSS score of CVE-2026-12378?
CVE-2026-12378 has a CVSS v3.1 base score of 8.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-12378?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12378, 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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