#VU25776 Stored cross-site scripting in Appointment Booking Calendar - CVE-2020-9371

Vulnerability identifier: #VU25776

Vulnerability risk: Low

CVSSv4.0: 2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P/U:Clear]

CVE-ID: CVE-2020-9371

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Appointment Booking Calendar
Web applications / Modules and components for CMS

Vendor: CodePeople

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in the "cpabc_appointments.php" file. A remote authenticated attacker can permanently inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Appointment Booking Calendar: 1.3.01 - 1.3.34

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External links
https://drive.google.com/open?id=1NNcYPaJir9SleyVr4cSPqpI2LNM7rtx9
https://wordpress.org/plugins/appointment-booking-calendar/#developers
https://wpvulndb.com/vulnerabilities/10110
https://www.hotdreamweaver.com/support/view.php?id=815925

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.