CVE-2023-53976 | THREATINT

Description

myBB Forums 1.8.26 contains a stored cross-site scripting vulnerability in the template management system that allows authenticated administrators to inject malicious scripts when creating new templates. Attackers can exploit this vulnerability by inserting script payloads in the template title field when adding new templates through the 'Templates and Style' > 'Templates' > 'Manage Templates' > 'Global Templates' interface, causing arbitrary JavaScript to execute when the template is viewed.

PUBLISHED Reserved 2025-12-20 | Published 2025-12-22 | Updated 2025-12-27 | 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.cve.org/CVERecord?id=CVE-2021-41866

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

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

www.vulncheck.com/...-site-scripting-via-template-management (VulnCheck Advisory: myBB Forums 1.8.26 Stored Cross-Site Scripting via Template Management) third-party-advisory

cve.org (CVE-2023-53976)

nvd.nist.gov (CVE-2023-53976)

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