The Charitable WordPress plugin before 1.8.12 does not verify the authenticity of incoming Square payment webhook events in a default configuration, allowing unauthenticated attackers to forge webhook notifications that mark donations as paid without any real payment.
CVE-2026-16650
MEDIUMPre-NVD 5.35.3—Trending — 3 sources updated this week
EchelonGraph scoreHIGH confidence
Score 5.3 from GitHub Security Advisory published 2026-08-21. a secondary CVSS source baseline 5.3; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 5.3Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- 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 computedSeverity53% × 45%Exploitation0% × 40%Automatability100% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- —
- EPSS %ILE
- —
- KEV
- Not listed
Published
August 21, 2026
Last Modified
August 21, 2026
Advisory Details (1)
Auto-updated Aug 21, 2026🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available
Charitable < 1.8.12 – Unauthenticated Donation Payment-Status Manipulation via Square Webhook Signature Bypass | CVE 2026-16650 | Plugin Vulnerabilities
https://wpscan.com/vulnerability/da611bd1-0702-4cdd-b04c-ad7210f78cfe/Vendor Advisories for CVE-2026-16650(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 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.
- 2026-08-21 13:20 UTCEG score recompute
- 2026-08-21 13:20 UTCGHSA enrichment
- 2026-08-21 13:09 UTCEG score recompute
- 2026-08-21 13:09 UTCGHSA enrichment
- 2026-08-21 12:19 UTCEG score recompute
- 2026-08-21 11:55 UTCEG score recompute
- 2026-08-21 11:54 UTCMITRE cvelistV5first tracked
Frequently asked(4)
What is CVE-2026-16650?
CVE-2026-16650 is a medium vulnerability published on August 21, 2026. The Charitable WordPress plugin before 1.8.12 does not verify the authenticity of incoming Square payment webhook events in a default configuration, allowing unauthenticated attackers to forge webhook notifications that mark donations as paid without any real payment.
When was CVE-2026-16650 disclosed?
CVE-2026-16650 was first published in the National Vulnerability Database on August 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-16650?
CVE-2026-16650 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-16650?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16650, 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
Explore the affected products and dependency analysis for CVE-2026-16650
Is Your Infrastructure Affected by CVE-2026-16650?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.