CVE-2026-11964

CRITICALPre-NVD 9.1Trending — 4 sources updated this weekElevated
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.1Exploit: NoneExposed: 0

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

The User Registration & Membership WordPress plugin before 5.2.2 does not verify the authenticity of incoming payment-provider webhook notifications before acting on them, allowing unauthenticated attackers to forge a payment-approved event and activate a paid membership subscription without completing a real payment.

CVSS v3
9.1
EG Score
0.0(none)
EPSS
17.5%
KEV
Not listed

Published

July 13, 2026

Last Modified

July 13, 2026

Advisory Details (1)

Auto-updated Jul 13, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

User Registration & Membership < 5.2.2 – Unauthenticated PayPal Webhook Signature Verification Bypass Leading to Membership Activation | CVE 2026-11964 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/faf55649-8f76-4abf-a6b9-0d0774e22d29/

Vendor Advisories for CVE-2026-11964(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 7× in last 7d / 7× 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 16:57 UTCEPSS rescore
  2. 2026-07-15 02:00 UTCEPSS rescore
  3. 2026-07-13 22:30 UTCEPSS rescore
  4. 2026-07-13 16:22 UTCMITRE cvelistV5CVSS v3 → 9.1 · severity → CRITICAL
  5. 2026-07-13 08:08 UTCNVD update
  6. 2026-07-13 06:34 UTCEG score recompute
  7. 2026-07-13 06:32 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-11964?
CVE-2026-11964 is a critical vulnerability published on July 13, 2026. The User Registration & Membership WordPress plugin before 5.2.2 does not verify the authenticity of incoming payment-provider webhook notifications before acting on them, allowing unauthenticated attackers to forge a payment-approved event and activate a paid membership subscription without…
When was CVE-2026-11964 disclosed?
CVE-2026-11964 was first published in the National Vulnerability Database on July 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-11964 actively exploited?
CVE-2026-11964 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-11964?
CVE-2026-11964 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 0.0.
How do I remediate CVE-2026-11964?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-11964, 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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