yBB Forums 1.8.26 contains a stored cross-site scripting vulnerability in the forum announcement system that allows authenticated administrators to inject malicious scripts when creating announcements. Attackers can exploit this vulnerability by inserting script payloads in the announcement title field when adding announcements through the 'Forums and Posts' > 'Forum Announcements' interface, causing arbitrary JavaScript to execute when the announcement is displayed on the forum.
| Link | Resource |
|---|---|
| https://mybb.com/ | Product |
| https://www.exploit-db.com/exploits/51136 | Exploit |
| https://www.vulncheck.com/advisories/mybb-forums-stored-cross-site-scripting-via-forum-announcements | Exploit Third Party Advisory |
27 Dec 2025, 17:15
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.4 |
| References | () https://www.vulncheck.com/advisories/mybb-forums-stored-cross-site-scripting-via-forum-announcements - Exploit, Third Party Advisory |
26 Dec 2025, 16:06
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://mybb.com/ - Product | |
| References | () https://www.exploit-db.com/exploits/51136 - Exploit | |
| References | () https://www.vulncheck.com/advisories/mybb-forums-stored-cross-site-scripting-via-forum-announcements - Third Party Advisory, Exploit | |
| First Time |
Mybb mybb
Mybb |
|
| CPE | cpe:2.3:a:mybb:mybb:1.8.26:*:*:*:*:*:*:* |
22 Dec 2025, 22:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Published : 2025-12-22 22:16
Updated : 2025-12-27 17:15
NVD link : CVE-2023-53978
Mitre link : CVE-2023-53978
CVE.ORG link : CVE-2023-53978
JSON object : View
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')