What’s Vulnerable › Vulnerabilities

CVE-2020-36389

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-06-17 · updated 2026-06-17
• Weakness: CWE-352

Description

In CiviCRM before 5.28.1 and CiviCRM ESR before 5.27.5 ESR, the CKEditor configuration form allows CSRF.

Affected products

• CiviCRM: before 5.27.5; before 5.28.1 — fixed in 5.27.5, 5.28.1

How to fix

Upgrade to a fixed version: CiviCRM 5.27.5, 5.28.1. Check the vendor advisory for mitigations.

References

• https://blog.sonarsource.com/civicrm-code-execution-vulnerability-chain-explained/
• https://civicrm.org/advisory/civi-sa-2020-11-csrf-ckeditor-configuration-form
• https://blog.sonarsource.com/civicrm-code-execution-vulnerability-chain-explained/
• https://civicrm.org/advisory/civi-sa-2020-11-csrf-ckeditor-configuration-form

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