CVE-2026-77689

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-09-12. 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%CVSS: 5.3Exploit: None knownExposed: 0

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

The Booking for Appointments and Events Calendar WordPress plugin before 9.8.1 does not verify that a payment was actually taken before recording a booking as paid, trusting the payment gateway named in a public, unauthenticated booking request even when the site has never configured that gateway. This lets an unauthenticated attacker obtain confirmed, fully paid appointments and events without any payment being collected.

CVSS v3
5.3
EG Score
5.3(high)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
21%
KEV
Not listed

Published

September 12, 2026

Last Modified

September 14, 2026

Advisory Details (1)

Auto-updated Sep 12, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Amelia Pro 9.0 – 9.8 – Unauthenticated Payment Bypass | CVE 2026-77689 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/ac597716-193d-419f-b55c-802ee979385e/

Vendor Advisories for CVE-2026-77689(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 20× in last 7d / 42× 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. 2026-09-25 06:24 UTCEG score recompute
  2. 2026-09-25 06:24 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-24 08:04 UTCEG score recompute
  5. 2026-09-24 08:04 UTCGHSA enrichment
  6. 2026-09-23 17:54 UTCEPSS rescore
  7. 2026-09-23 09:44 UTCEG score recompute
  8. 2026-09-23 09:44 UTCGHSA enrichment
  9. 2026-09-22 16:01 UTCEPSS rescore
  10. 2026-09-22 11:23 UTCEG score recompute
  11. 2026-09-22 11:23 UTCGHSA enrichment
  12. 2026-09-21 21:09 UTCEPSS rescore
  13. 2026-09-21 13:03 UTCEG score recompute
  14. 2026-09-21 13:03 UTCGHSA enrichment
  15. 2026-09-20 20:16 UTCEPSS rescore
  16. 2026-09-20 14:42 UTCGHSA enrichment
  17. 2026-09-19 16:17 UTCEG score recompute
  18. 2026-09-19 16:17 UTCGHSA enrichment
  19. 2026-09-18 19:28 UTCEPSS rescore
  20. 2026-09-18 17:57 UTCGHSA enrichment
  21. 2026-09-17 19:36 UTCEG score recompute
  22. 2026-09-17 19:36 UTCGHSA enrichment
  23. 2026-09-16 18:06 UTCEG score recompute
  24. 2026-09-16 18:05 UTCGHSA enrichment
  25. 2026-09-16 14:08 UTCEPSS rescore
Show 17 more
  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-15 19:41 UTCEG score recompute
  3. 2026-09-15 19:41 UTCGHSA enrichment
  4. 2026-09-15 03:12 UTCEPSS rescore
  5. 2026-09-15 03:12 UTCEPSS rescore
  6. 2026-09-14 21:19 UTCGHSA enrichment
  7. 2026-09-14 13:07 UTCEG score recompute
  8. 2026-09-14 13:07 UTCGHSA enrichment
  9. 2026-09-13 14:46 UTCEG score recompute
  10. 2026-09-13 14:46 UTCGHSA enrichment
  11. 2026-09-12 16:23 UTCGHSA enrichment
  12. 2026-09-12 15:44 UTCEG score recompute▲ 5.30
  13. 2026-09-12 15:44 UTCGHSA enrichment
  14. 2026-09-12 15:43 UTCMITRE cvelistV5CVSS v3 → 5.3 · severity → MEDIUM
  15. 2026-09-12 06:20 UTCNVD update
  16. 2026-09-12 06:14 UTCEG score recompute
  17. 2026-09-12 06:13 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-77689?
CVE-2026-77689 is a medium vulnerability published on September 12, 2026. The Booking for Appointments and Events Calendar WordPress plugin before 9.8.1 does not verify that a payment was actually taken before recording a booking as paid, trusting the payment gateway named in a public, unauthenticated booking request even when the site has never configured that gateway.…
When was CVE-2026-77689 disclosed?
CVE-2026-77689 was first published in the National Vulnerability Database on September 12, 2026, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77689 actively exploited?
CVE-2026-77689 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 79.5% of all scored CVEs.
What is the CVSS score of CVE-2026-77689?
CVE-2026-77689 has a CVSS v3.1 base score of 5.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-77689?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77689, 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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