CVE-2026-90981 satollo CVE debrief

Who should care

Administrators of WordPress installations with the Newsletter plugin should be aware of this vulnerability and take steps to mitigate it. They should verify their version and update to a patched version if available. Additionally, they should ensure that input sanitization and output escaping are properly handled for administrator-visible output to prevent similar vulnerabilities in the future. This includes reviewing and enhancing the security measures in

Why it matters

CVE-2026-90981 is a Reflected Cross-Site Scripting vulnerability in the Newsletter – Send awesome emails from WordPress plugin for WordPress. Administrators of WordPress installations with this plugin should verify their version and update to a patched version if available. They should also ensure that input sanitization and output escaping are properly handled for administrator-visible output.

• Administrators may be tricked into performing an action that allows an attacker to inject arbitrary web scripts
• Successful exploitation could allow an attacker to execute scripts in pages that are visible to administrators

Technical summary

The Newsletter – Send awesome emails from WordPress plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'nn' parameter in all versions up to, and including, 9.3.8. This is due to insufficient input sanitization and output escaping. Successful exploitation requires the victim to be a logged-in administrator. The vulnerability can be exploited by injecting arbitrary web scripts in pages that are visible to administrators, potentially leading to unauthorized actions or data breaches within the WordPress environment.

Defensive priority

Administrators of WordPress installations with the Newsletter plugin should verify their version and update to a patched version if available. They should also ensure that input sanitization and output escaping are properly handled for administrator-visible output.

Recommended defensive actions

• Verify the version of the Newsletter plugin and update to a patched version if available
• Ensure input sanitization and output escaping are properly handled for administrator-visible output
• Monitor for potential exploitation attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its existence in all versions up to 9.3.8 of the Newsletter plugin and the requirement for the victim to be a logged-in administrator for successful exploitation.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.