SB2019031101 - XSS in Upcoming Events plugin for MyBB

Description

This security bulletin contains information about 1 security vulnerability.

1) Cross-site scripting (CVE-ID: CVE-2019-9650)

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

The vulnerability exists due to insufficient sanitization of user-supplied input when processing data passed via a specially crafted name for an event in the "upcoming_events.php" script. A remote attacker can trick the victim to follow a specially specially crafted link 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.

Remediation

Install update from vendor's website.

References

• https://community.mybb.com/mods.php?action=changelog&pid=1231
• https://github.com/vintagedaddyo/MyBB_Plugin-Upcoming_Events/pull/1/commits/d0a0e1c6e56f248613e0150344ebea8764bba5fa