CVE-2023-53978 | THREATINT

Description

myBB 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.

PUBLISHED Reserved 2025-12-20 | Published 2025-12-22 | Updated 2025-12-30 | Assigner VulnCheck

MEDIUM: 5.1CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

MEDIUM: 5.4CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Problem types

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

1.8.26

affected

Credits

Andrey Stoykov finder

References

www.exploit-db.com/exploits/51136 (ExploitDB-51136) exploit

mybb.com/ (Official myBB Software Version Page) product

www.vulncheck.com/...-site-scripting-via-forum-announcements (VulnCheck Advisory: myBB Forums 1.8.26 Stored Cross-Site Scripting via Forum Announcements) third-party-advisory

cve.org (CVE-2023-53978)

nvd.nist.gov (CVE-2023-53978)

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