CVE-2026-12378

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH 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
8.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.1Exploit: NoneExposed: 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(high)
EPSS
31.1%
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 27× in last 7d / 33× 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.

  1. 2026-07-15 19:54 UTCEG score recompute
  2. 2026-07-15 19:54 UTCGHSA enrichment
  3. 2026-07-15 16:57 UTCEPSS rescore
  4. 2026-07-15 07:00 UTCEG score recompute
  5. 2026-07-15 07:00 UTCGHSA enrichment
  6. 2026-07-15 02:00 UTCEPSS rescore
  7. 2026-07-14 18:07 UTCEG score recompute
  8. 2026-07-14 18:07 UTCGHSA enrichment
  9. 2026-07-14 05:14 UTCEG score recompute
  10. 2026-07-14 05:14 UTCGHSA enrichment
  11. 2026-07-13 22:30 UTCEPSS rescore
  12. 2026-07-13 16:19 UTCEG score recompute
  13. 2026-07-13 16:19 UTCGHSA enrichment
  14. 2026-07-13 06:12 UTCEPSS rescore
  15. 2026-07-13 03:23 UTCEG score recompute
  16. 2026-07-13 03:23 UTCGHSA enrichment
  17. 2026-07-12 14:30 UTCEG score recompute
  18. 2026-07-12 14:30 UTCGHSA enrichment
  19. 2026-07-12 05:46 UTCEPSS rescore
  20. 2026-07-12 01:36 UTCEG score recompute
  21. 2026-07-12 01:36 UTCGHSA enrichment
  22. 2026-07-11 12:43 UTCEG score recompute
  23. 2026-07-11 12:43 UTCGHSA enrichment
  24. 2026-07-11 08:27 UTCEPSS rescore
  25. 2026-07-10 23:50 UTCEG score recompute▲ 8.10
Show 8 more
  1. 2026-07-10 23:50 UTCGHSA enrichment
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-08 15:15 UTCEPSS rescore
  4. 2026-07-08 15:15 UTCEPSS rescore
  5. 2026-07-08 10:50 UTCMITRE cvelistV5CVSS v3 → 8.1 · severity → HIGH
  6. 2026-07-08 08:34 UTCNVD update
  7. 2026-07-08 06:35 UTCEG score recompute
  8. 2026-07-08 06:35 UTCMITRE cvelistV5first tracked

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 31.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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.

Dependency Blast Radius

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