CVE-2024-10054: Happyforms < 1.26.3 - Admin+ Stored XSS

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2025-05-15 · updated 2026-06-17
Weakness: CWE-79

Description

The Happyforms WordPress plugin before 1.26.3 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup).

Affected products

Happyforms: before 1.26.3 — fixed in 1.26.3

How to fix

Upgrade to a fixed version: Happyforms 1.26.3. Check the vendor advisory for mitigations.

References

https://wpscan.com/vulnerability/5a9fd64b-3207-4acb-92ff-1cca08c41ac9/
https://wpscan.com/vulnerability/5a9fd64b-3207-4acb-92ff-1cca08c41ac9/

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