CVE-2026-16495 wpdevart CVE debrief

Who should care

Defenders responsible for WordPress installations with the Countdown Timer – Widget Countdown plugin should assess exposure and prioritize verification and potential updates. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify the presence of affected versions, assess the potential impact, and implement necessary security measures to prevent exploitation.

Why it matters

CVE-2026-16495 is a Stored Cross-Site Scripting vulnerability in the Countdown Timer – Widget Countdown plugin for WordPress. Defenders should prioritize verifying and updating the plugin, monitoring for exploitation attempts, and implementing additional security measures to prevent similar vulnerabilities. Exposure and potential impact require verification from official sources.

• Attackers may inject malicious scripts, potentially leading to user exploitation.
• Successful exploitation could result in unauthorized actions within the affected application.
• Defenders must verify and update the plugin to prevent exploitation.
• Exposure requires verification from official sources due to limited information on affected versions and remediation.

Technical summary

The Countdown Timer – Widget Countdown plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'redirect_url' Shortcode Attribute in all versions up to, and including, 3.0.1. This allows authenticated attackers with contributor-level access and above to inject arbitrary web scripts in pages that will execute when a user accesses an injected page. The vulnerability's technical impact includes the potential for attackers to inject malicious scripts, leading to unauthorized actions within the affected application. Defenders should prioritize verifying and updating the plugin to a patched version, if available, and monitor for potential exploitation attempts.

Defensive priority

Defenders should prioritize verifying and updating the plugin to a patched version, if available, and monitor for potential exploitation attempts.

Recommended defensive actions

• Verify and update the Countdown Timer – Widget Countdown plugin to a patched version, if available.
• Monitor for potential exploitation attempts and review user access and permissions.
• Implement additional security measures, such as input validation and output escaping, to prevent similar vulnerabilities.
• 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 source item provide details on the vulnerability, including its description, affected versions, and references to additional information. Defenders should verify the affected versions, assess exposure, and review official advisories for remediation guidance. The information available indicates that the vulnerability affects all versions up to, and including, 3.0.1 of the Countdown Timer – Widget Countdown plugin for WordPress. However, specific details about the vulnerability's impact and potential exploitation are

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.