Platform
wordpress
Component
simply-schedule-appointments
Fixed in
1.6.10
CVE-2026-39495 describes a blind SQL Injection vulnerability discovered in Simply Schedule Appointments. This flaw allows unauthorized access to sensitive data stored within the application's database. Versions of Simply Schedule Appointments from 0 through 1.6.9.27 are affected. A patch is available in version 1.6.9.29.
The SQL Injection vulnerability in Simply Schedule Appointments allows an attacker to bypass authentication and directly query the database. Because it's a 'blind' SQL Injection, the attacker doesn't receive direct output from the queries, instead inferring data based on the application's responses (e.g., timing differences, error messages). This makes exploitation more complex but still allows for data exfiltration. Sensitive data at risk includes patient information (names, addresses, medical history), appointment details, and potentially administrative credentials. Successful exploitation could lead to significant data breaches and compromise the confidentiality and integrity of the system. While the blind nature of the injection limits immediate impact, persistent probing can reveal substantial amounts of data over time. There are no known direct precedents for this specific vulnerability, but the underlying SQL Injection technique is well-established and frequently exploited.
CVE-2026-39495 was published on 2026-04-08. The vulnerability's CVSS score is 8.5 (HIGH), indicating a significant risk. There is no indication of this vulnerability being actively exploited in the wild at this time. No public Proof-of-Concept (PoC) exploits have been publicly released. The vulnerability is not currently listed on CISA Known Exploited Vulnerabilities (KEV) catalog, nor does it have an EPSS score assigned, suggesting a low to medium probability of exploitation in the near term.
Exploit Status
EPSS
0.03% (9% percentile)
CVSS Vector
The primary mitigation for CVE-2026-39495 is to immediately upgrade Simply Schedule Appointments to version 1.6.9.29 or later. If upgrading is not immediately feasible, consider implementing temporary workarounds. Restrict network access to the Simply Schedule Appointments server to only authorized users and systems. Implement a Web Application Firewall (WAF) with rules designed to detect and block SQL Injection attempts, specifically looking for unusual SQL syntax in user input. Input validation and sanitization on all user-supplied data is crucial, though this is not a complete mitigation on its own. Monitor application logs for suspicious activity, such as repeated failed login attempts or unusual database queries. After upgrading, confirm the vulnerability is resolved by attempting a SQL Injection payload through a non-critical input field and verifying that it does not return any unexpected data or errors.
Update to version 1.6.9.29, or a newer patched version
Vulnerability analysis and critical alerts directly to your inbox.
It's a blind SQL Injection vulnerability in Simply Schedule Appointments allowing attackers to extract data by inferring responses.
If you're using Simply Schedule Appointments versions 0 through 1.6.9.27, you are potentially affected by this vulnerability.
Upgrade to Simply Schedule Appointments version 1.6.9.29 or later to resolve the SQL Injection vulnerability.
There is currently no public evidence of CVE-2026-39495 being actively exploited in the wild.
Refer to the official NSquared advisory and the NVD entry for CVE-2026-39495 for detailed information.
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