What’s Vulnerable › Vulnerabilities

CVE-2023-5660: SendPress Newsletters <= 1.22.3.31 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode

• Severity: medium (CVSS 5.4 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: 2023-11-07 · updated 2026-06-17
• Weakness: CWE-79

Description

The SendPress Newsletters plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's shortcode(s) in all versions up to, and including, 1.22.3.31 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers with contributor-level and above permissions to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Affected products

• SendPress Newsletters: before 1.23.11.6 — fixed in 1.23.11.6

How to fix

Upgrade to a fixed version: SendPress Newsletters 1.23.11.6. Check the vendor advisory for mitigations.

References

• https://plugins.trac.wordpress.org/browser/sendpress/tags/1.22.3.31/classes/sc/class-sendpress-sc-unsubscribe-form.php#L57
• https://plugins.trac.wordpress.org/changeset/2990357/sendpress#file5
• https://www.wordfence.com/threat-intel/vulnerabilities/id/cbce42a0-29a7-40df-973c-1fe7338f6c94?source=cve
• https://plugins.trac.wordpress.org/browser/sendpress/tags/1.22.3.31/classes/sc/class-sendpress-sc-unsubscribe-form.php#L57
• https://www.wordfence.com/threat-intel/vulnerabilities/id/cbce42a0-29a7-40df-973c-1fe7338f6c94?source=cve

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