CVE-2020-19048

5.4 mediumEPSS 0.7%

Medium (5.4) in mybb mybb. EPSS 0.7% chance of exploitation in the next 30 days.

Cross Site Scripting (XSS) in MyBB v1.8.20 allows remote attackers to inject arbitrary web script or HTML via the "Title" field found in the "Add New Forum" page by doing an authenticated POST HTTP request to '/Upload/admin/index.php?module=forum-management&action=add'.

Severity

CVSS 3.1

5.4 medium

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.7% chance of exploitation in the next 30 days; higher than 53% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2021-08-31
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

mybb:mybb

References

https://github.com/joelister/bug/issues/1
https://github.com/joelister/bug/issues/1

Check your stack JSON