Vulnerability in Charitable

CVE-2026-16650

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.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (4.9th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 4.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-16650: held from 0.001 to 0.002.

EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.000

Affected products

  • Charitable

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-16650?
CVE-2026-16650 is a medium-severity vulnerability in Charitable, classified under Insufficient Verification of Data Authenticity. CVSS score: 5.3/10. Published 2026-08-21.
How severe is CVE-2026-16650?
Medium severity. CVSS v3 base score is 5.3 out of 10.