CVE-2026-89063

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-16. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

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

The Online Scheduling and Appointment Booking System – Bookly plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 28.1 via the 'conversation_id' parameter due to missing validation on a user controlled key. This makes it possible for unauthenticated attackers to read the full AI booking conversation transcript of any customer — leaking names, email addresses, phone numbers, and appointment details echoed by the assistant — and inject arbitrary messages into any victim conversation that are subsequently replayed to the Cloud AI worker along with the full private history. Because AI conversations are stored with no owner, user, or session identifier and conversation IDs are sequential integers, an unauthenticated attacker can enumerate all customer conversations simply by incrementing the conversation_id parameter.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
33%
KEV
Not listed

Published

September 16, 2026

Last Modified

September 17, 2026

References (6)

Vendor Advisories for CVE-2026-89063(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 27× in last 7d / 27× 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. 2026-09-20 23:46 UTCEG score recompute
  2. 2026-09-20 23:46 UTCGHSA enrichment
  3. 2026-09-20 20:16 UTCEPSS rescore
  4. 2026-09-20 12:43 UTCGHSA enrichment
  5. 2026-09-20 01:40 UTCEG score recompute
  6. 2026-09-20 01:40 UTCGHSA enrichment
  7. 2026-09-19 14:37 UTCGHSA enrichment
  8. 2026-09-19 03:34 UTCEG score recompute
  9. 2026-09-19 03:34 UTCGHSA enrichment
  10. 2026-09-18 19:28 UTCEPSS rescore
  11. 2026-09-18 16:32 UTCGHSA enrichment
  12. 2026-09-18 05:29 UTCEG score recompute
  13. 2026-09-18 05:29 UTCGHSA enrichment
  14. 2026-09-17 19:32 UTCEPSS rescore
  15. 2026-09-17 18:26 UTCEG score recompute
  16. 2026-09-17 18:26 UTCGHSA enrichment
  17. 2026-09-17 18:00 UTCEG score recompute
  18. 2026-09-17 18:00 UTCGHSA enrichment
  19. 2026-09-17 16:10 UTCGHSA enrichment
  20. 2026-09-17 05:07 UTCGHSA enrichment
  21. 2026-09-16 18:04 UTCGHSA enrichment
  22. 2026-09-16 17:15 UTCEG score recompute
  23. 2026-09-16 17:14 UTCGHSA enrichment
  24. 2026-09-16 14:09 UTCEPSS rescore
  25. 2026-09-16 05:18 UTCEG score recompute
Show 2 more
  1. 2026-09-16 04:38 UTCEG score recompute
  2. 2026-09-16 04:37 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-89063?
CVE-2026-89063 is a high vulnerability published on September 16, 2026. The Online Scheduling and Appointment Booking System – Bookly plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 28.1 via the 'conversationid' parameter due to missing validation on a user controlled key. This makes it possible for…
When was CVE-2026-89063 disclosed?
CVE-2026-89063 was first published in the National Vulnerability Database on September 16, 2026, with the most recent update on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-89063 actively exploited?
CVE-2026-89063 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 66.9% of all scored CVEs.
What is the CVSS score of CVE-2026-89063?
CVE-2026-89063 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-89063?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-89063, 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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