joedolson My Calendar Plugin up to 3.7.8 Authentication mc_auth sql injection

Summaryinfo

A vulnerability was found in joedolson My Calendar Plugin up to 3.7.8 and classified as critical. Affected by this issue is some unknown functionality of the component Authentication Handler. Executing a manipulation of the argument mc_auth can lead to sql injection. This vulnerability appears as CVE-2026-6854. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in joedolson My Calendar Plugin up to 3.7.8. It has been declared as critical. This vulnerability affects an unknown code of the component Authentication Handler. The manipulation of the argument mc_auth with an unknown input leads to a sql injection vulnerability. The CWE definition for the vulnerability is CWE-89. The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The My Calendar – Accessible Event Manager plugin for WordPress is vulnerable to time-based blind SQL Injection via the 'mc_auth' parameter in all versions up to, and including, 3.7.8 due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query. This makes it possible for unauthenticated attackers to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database.

The advisory is shared for download at wordfence.com. This vulnerability was named CVE-2026-6854 since 04/22/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/08/2026). The MITRE ATT&CK project declares the attack technique as T1505.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Calendar Software

Vendor

• joedolson

Name

• My Calendar Plugin

Version

• 3.7.0
• 3.7.1
• 3.7.2
• 3.7.3
• 3.7.4
• 3.7.5
• 3.7.6
• 3.7.7
• 3.7.8

CPE 2.3info

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CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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