Cross-site scripting in MyBB - CVE-2018-15596
Published: August 28, 2018 / Updated: June 17, 2021
Vulnerability identifier: #VU36761
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P/U:Clear
CVE-ID: CVE-2018-15596
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vendor: MyBB Group
Affected software:
MyBB
MyBB
Detailed vulnerability description
The vulnerability allows a remote non-authenticated attacker to read and manipulate data.
An issue was discovered in inc/class_feedgeneration.php in MyBB 1.8.17. On the forum RSS Syndication page, one can generate a URL such as http://localhost/syndication.php?fid=&type=atom1.0&limit=15. The thread titles (within title elements of the generated XML documents) aren't sanitized, leading to XSS.
How to mitigate CVE-2018-15596
Install update from vendor's website.