What’s Vulnerable › Vulnerabilities

CVE-2023-45556

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-11-06 · updated 2026-06-17
• Weakness: CWE-79

Description

Cross Site Scripting vulnerability in Mybb Mybb Forums v.1.8.33 allows a local attacker to execute arbitrary code via the theme Name parameter in the theme management component.

Affected products

• mybb: before 1.8.37 — fixed in 1.8.37

How to fix

Upgrade to a fixed version: mybb 1.8.37. Check the vendor advisory for mitigations.

References

• https://github.com/Or4ngm4n/Mybb/blob/main/MyBB%201.8.33%20Cross%20Site%20Scripting.txt
• https://github.com/mybb/mybb/security/advisories/GHSA-4xqm-3cm2-5xgf
• https://raw.githubusercontent.com/Or4ngm4n/Mybb/main/Screenshot%202023-10-08%20012112.png
• https://github.com/Or4ngm4n/Mybb/blob/main/MyBB%201.8.33%20Cross%20Site%20Scripting.txt
• https://github.com/mybb/mybb/security/advisories/GHSA-4xqm-3cm2-5xgf
• https://raw.githubusercontent.com/Or4ngm4n/Mybb/main/Screenshot%202023-10-08%20012112.png

Get alerted when CVE-2023-45556 or the next vulnerability affects your stack