What’s Vulnerable › Vulnerabilities

CVE-2021-23262: Snakeyaml deserialization vulnerability bypass

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-12-02 · updated 2026-06-17
• Weakness: CWE-913

Description

Authenticated administrators may modify the main YAML configuration file and load a Java class resulting in RCE.

Affected products

• Crafter Software Crafter CMS: from 3.1.0 before 3.1.13 — fixed in 3.1.13

How to fix

Upgrade to a fixed version: Crafter Software Crafter CMS 3.1.13. Check the vendor advisory for mitigations.

References

• https://docs.craftercms.org/en/3.1/security/advisory.html#cv-2021120105
• https://docs.craftercms.org/en/3.1/security/advisory.html#cv-2021120105

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