PT-2023-27327 · Google · Google Api

Marco Wotschka · Published 2023-09-29 · Updated 2023-10-26 · CVE-2023-4021

Positive Technologies (AI Summary)

CVSS v3.1

4.8

Medium

Base vector

AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Modern Events Calendar lite plugin for WordPress versions up to, but not including, 7.1.0

Description The issue is related to Stored Cross-Site Scripting via Google API key and Calendar ID due to insufficient input sanitization and output escaping. This allows authenticated attackers with administrator-level permissions and above to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The issue only affects multi-site installations and installations where unfiltered html has been disabled.

Recommendations For versions up to, but not including, 7.1.0, update to version 7.1.0 or later to resolve the issue. As a temporary workaround, consider restricting access to the Google API key and Calendar ID fields to minimize the risk of exploitation. Additionally, enabling unfiltered html or taking other measures to ensure proper input sanitization and output escaping can help mitigate the risk.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2023-4021

Affected Products

Google Api

References · 7

• https://osv.dev/vulnerability/CVE-2023-4021 · Vendor Advisory
• https://webnus.net/modern-events-calendar/change-log · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2023-4021 · Security Note
• https://twitter.com/CVEnew/status/1715271079130771863 · Twitter Post
• https://twitter.com/yourwpguy/status/1707752720625479729 · Twitter Post
• https://wordfence.com/threat-intel/vulnerabilities/id/f213fb42-5bab-4017-80ea-ce6543031af2?source=cve · Note
• https://t.me/cvenotify/59796 · Telegram Post