CVE-2024-53860: Potential Abuse for Sending Arbitrary Emails in sp-php-email-handler

Severity: high (CVSS 8.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-11-27 · updated 2026-06-17
Weakness: CWE-74

Description

sp-php-email-handler is a PHP package for handling contact form submissions. Messages sent using this script are vulnerable to abuse, as the script allows anybody to specify arbitrary email recipients and include user-provided content in confirmation emails. This could enable malicious actors to use your server to send spam, phishing emails, or other malicious content, potentially damaging your domain's reputation and leading to blacklisting by email providers. Patched in version 1.0.0 by removing user-provided content from confirmation emails. All pre-release versions (alpha and beta) are vulnerable to this issue and should not be used. There are no workarounds for this issue. Users must upgrade to version 1.0.0 to mitigate the vulnerability.

Affected products

Spencer14420 SPEmailHandler-PHP: before 1.0.0 — fixed in 1.0.0

How to fix

Upgrade to a fixed version: Spencer14420 SPEmailHandler-PHP 1.0.0. Check the vendor advisory for mitigations.

References

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