CVE-2026-110382 NSquared CVE debrief

Who should care

Defenders responsible for Simply Schedule Appointments installations, web application security, and user data protection should be aware of this vulnerability and take necessary actions to prevent potential XSS attacks.

Why it matters

CVE-2026-110382 is a Stored Cross-site Scripting (XSS) vulnerability in Simply Schedule Appointments plugin versions up to 1.6.12.35. Defenders should prioritize verifying and updating installations to prevent potential XSS attacks, which could lead to confidentiality and integrity impacts.

• Potential injection of malicious scripts into web pages viewed by other users
• Possible exploitation requires user interaction (UI:R) and can lead to confidentiality and integrity impacts
• Defenders need to verify and update Simply Schedule Appointments installations to prevent potential XSS attacks

Technical summary

The Simply Schedule Appointments plugin is vulnerable to Stored Cross-site Scripting (XSS). This issue affects versions from n/a through 1.6.12.35. The vulnerability has a CVSS score of 7.1 and is classified as HIGH severity. The vulnerability allows for Stored XSS, potentially enabling attackers to inject malicious scripts into web pages viewed by other users. Defenders should prioritize verifying and updating Simply Schedule Appointments installations to prevent potential XSS attacks. The CVE record and NVD entry provide additional information on the vulnerability.

Defensive priority

Defenders should prioritize verifying and updating Simply Schedule Appointments installations to prevent potential XSS attacks.

Recommended defensive actions

• Verify Simply Schedule Appointments plugin version and update to a fixed version if necessary
• Implement input validation and output encoding to prevent XSS attacks
• Monitor web application logs for suspicious activity
• 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 CVSS score of 7.1 and severity classification as HIGH. The vulnerability affects Simply Schedule Appointments plugin versions up to 1.6.12.35. Defenders should verify and update installations to prevent potential XSS attacks. The NVD entry provides additional information on the vulnerability, including its potential impact and 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.