What’s Vulnerable › Vulnerabilities

CVE-2023-45303

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-10-06 · updated 2026-06-17
• Weakness: CWE-74

Description

ThingsBoard before 3.5 allows Server-Side Template Injection if users are allowed to modify an email template, because Apache FreeMarker supports freemarker.template.utility.Execute (for content sent to the /api/admin/settings endpoint).

Affected products

• ThingsBoard: before 3.5 — fixed in 3.5

How to fix

Upgrade to a fixed version: ThingsBoard 3.5. Check the vendor advisory for mitigations.

References

• https://freemarker.apache.org/docs/api/freemarker/template/utility/Execute.html
• https://herolab.usd.de/security-advisories/usd-2023-0010/
• https://freemarker.apache.org/docs/api/freemarker/template/utility/Execute.html
• https://herolab.usd.de/security-advisories/usd-2023-0010/

Get alerted when CVE-2023-45303 or the next vulnerability affects your stack