Mybb vulnerabilities
Published CVEs affecting Mybb products: 13 record(s), with severity, exploitation and fixes.
Mybb 4myBB forums 3Thankyou/like System 1Mybb Downloads 1My Arcade 1Last User Threads 1Thread Redirect 1Trending Widget 1Delete Account 1MyBB Timeline Plugin 1MyBB My Arcade Plugin 1MyBB Last User's Threads in Profile Plugin 1MyBB Downloads Plugin 1MyBB Recent threads 1MyBB Like Plugin 1
CVE-2021-47934
Medium · 5.3
CWE-79 May 16, 2026
MyBB Timeline Plugin 1.0 Cross-Site Scripting and CSRF
MyBB Timeline Plugin 1.0 contains cross-site scripting vulnerabilities that allow attackers to inject malicious scripts through thread titles, post content, and user profile fields like Location and Bio. Attackers can also exploit a cross-site request forgery vulnerability in the timeline.php profile action to change a user's cover picture by crafting malicious forms that execute when victims visit affected profiles.
CVE-2018-25309
Medium · 6.1
CWE-79 Apr 29, 2026
MyBB Recent threads 17.0 Persistent Cross-Site Scripting
MyBB Recent threads 17.0 contains a persistent cross-site scripting vulnerability that allows attackers to inject malicious scripts by creating threads with crafted subject lines. Attackers can create threads with script tags in the subject parameter to execute arbitrary JavaScript in the browsers of all users viewing the index page.
CVE-2018-25250
Medium · 6.1
CWE-79 Apr 4, 2026
MyBB Last User's Threads in Profile Plugin 1.2 Persistent XSS
MyBB Last User's Threads in Profile Plugin 1.2 contains a persistent cross-site scripting vulnerability that allows attackers to inject malicious scripts by crafting thread subjects with script tags. Attackers can create threads with script payloads in the subject field that execute when users visit the attacker's profile page.
CVE-2018-25249
Medium · 6.4
CWE-79 Apr 4, 2026
MyBB My Arcade Plugin 1.3 Persistent XSS via Comment
MyBB My Arcade Plugin 1.3 contains a persistent cross-site scripting vulnerability that allows authenticated users to inject malicious scripts through arcade game score comments. Attackers can add crafted HTML and JavaScript payloads in the comment field that execute when other users view or edit the comment.
CVE-2018-25248
High · 7.2
CWE-79 Apr 4, 2026
MyBB Downloads Plugin 2.0.3 Persistent XSS via downloads.php
MyBB Downloads Plugin 2.0.3 contains a persistent cross-site scripting vulnerability that allows regular members to inject malicious scripts through the download title field. Attackers can submit a new download with HTML/JavaScript code in the title parameter, which executes when administrators validate the download in downloads.php.
CVE-2018-25247
Medium · 6.1
CWE-79 Apr 4, 2026
MyBB Like Plugin 3.0.0 Cross-Site Scripting via User Profiles
MyBB Like Plugin 3.0.0 contains a stored cross-site scripting vulnerability. Authenticated attackers can inject script payloads into post or thread subjects; when other users view a profile that displays the attacker's liked posts, the unsanitized subject is rendered, executing the script in the viewer's browser.
CVE-2021-47905
Medium · 6.1
CWE-79 Jan 23, 2026
MyBB Delete Account Plugin 1.4 - Cross-Site Scripting
MyBB Delete Account Plugin 1.4 contains a cross-site scripting vulnerability in the account deletion reason input field. Attackers can inject malicious scripts that will execute in the admin interface when viewing delete account reasons.
CVE-2018-25132
Medium · 6.1
CWE-79 Jan 23, 2026
MyBB Trending Widget Plugin 1.2 - Cross-Site Scripting
MyBB Trending Widget Plugin 1.2 contains a cross-site scripting vulnerability that allows attackers to inject malicious scripts through thread titles. Attackers can modify thread titles with script payloads that will execute when other users view the trending widget.
CVE-2018-25116
Medium · 6.1
CWE-79 Jan 23, 2026
MyBB Thread Redirect Plugin 0.2.1 - Cross-Site Scripting
MyBB Thread Redirect Plugin 0.2.1 contains a cross-site scripting vulnerability in the custom text input field for thread redirects. Attackers can inject malicious SVG scripts that will execute when other users view the thread, allowing arbitrary script execution.
CVE-2023-53979
High · 8.8
CWE-22 Dec 22, 2025
MyBB 1.8.32 Authenticated Remote Code Execution via Chained Vulnerabilities
MyBB 1.8.32 contains a chained vulnerability that allows authenticated administrators to bypass avatar upload restrictions and execute arbitrary code. Attackers can modify upload path settings, upload a malicious PHP-embedded image file, and execute commands through the language configuration editing interface.
CVE-2023-53978
Medium · 5.4
CWE-79 Dec 22, 2025
myBB Forums 1.8.26 Stored Cross-Site Scripting via Forum Announcements
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.
CVE-2023-53977
Medium · 5.4
CWE-79 Dec 22, 2025
myBB Forums 1.8.26 Stored Cross-Site Scripting via Forum Management
myBB Forums 1.8.26 contains a stored cross-site scripting vulnerability in the forum management system that allows authenticated administrators to inject malicious scripts when creating new forums. Attackers can exploit this vulnerability by inserting script payloads in the forum title field when adding new forums through the 'Forums and Posts' > 'Forum Management' interface, causing arbitrary JavaScript to execute when the forum listing is viewed.
CVE-2023-53976
Medium · 5.4
CWE-79 Dec 22, 2025
myBB Forums 1.8.26 Stored Cross-Site Scripting via Template Management
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.