Simply Schedule Appointments Plugin 1.5.7.7/1.6.11.2/1.6.12.4 on WordPress authorization

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.0$0-$5k3.90

Summaryinfo

A vulnerability, which was classified as critical, has been found in Simply Schedule Appointments Plugin. The impacted element is an unknown function. The manipulation leads to authorization. This vulnerability is uniquely identified as CVE-2026-16540. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Simply Schedule Appointments Plugin. This issue affects an unknown functionality. The manipulation with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-863. The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

The Simply Schedule Appointments WordPress plugin before 1.6.12.6 does not correctly restrict a bulk appointment operation to the requester's own records, allowing unauthenticated users to retrieve the personal data of all appointments across the site and, on premium editions, to permanently delete them.

The advisory is shared at wpscan.com. The identification of this vulnerability is CVE-2026-16540 since 07/22/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available.

Upgrading to version 1.6.12.6 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-51951). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Authorization
CWE: CWE-863 / CWE-285 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Simply Schedule Appointments Plugin 1.6.12.6

Timelineinfo

07/22/2026 CVE reserved
08/02/2026 +11 days Advisory disclosed
08/02/2026 +0 days VulDB entry created
08/02/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: wpscan.com
Status: Confirmed

CVE: CVE-2026-16540 (🔒)
GCVE (CVE): GCVE-0-2026-16540
GCVE (VulDB): GCVE-100-385337
EUVD: 🔒

Entryinfo

Created: 08/02/2026 08:34
Updated: 08/02/2026 13:50
Changes: 08/02/2026 08:34 (54), 08/02/2026 13:50 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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