MyBB 1.8.13


code 1813

Full Package

Install a new MyBB forum or upgrade from older versions.

.zip – 2.14 MB

Download from Download from (mirror)



More checksums…







Changed Files

Upgrade from the previous version.

.zip – 1.2 MB

Download from Download from (mirror)



More checksums…







How to verify packages

This update includes fixes related to compatibility with PostgreSQL, SQLite and PHP 7.2 and resolves attachment HTML output problems. Note that the theme’s CSS files may need to be updated.

Upgrading to this Version

To upgrade: copy and overwrite the files, and run the install/ upgrade script.

Before performing any upgrade, remember to backup your forum’s files and database and store them safely.

If you have edited core files, including language files, please make sure you make a changelog for these changes so you can make them again (if necessary) once the upgrade is complete.

Follow the Upgrade Documentation for more detailed instructions.

Security Vulnerabilities Addressed (7)

High risk

Installer RCE on configuration file write

CWE-94 CVSS:3.1/PR:N Reported by pabstersac

High risk

Language file headers RCE

CWE-94 CVSS:3.1/PR:H Reported by Julian Rittweger

Medium risk

Installer XSS

CWE-79 CVSS:3.1/PR:N Reported by pabstersac

Medium risk

Mod CP Edit Profile XSS

CWE-79 CVSS:3.1/PR:L Reported by Julian Rittweger

Low risk

Insufficient moderator permission check in delayed moderation tools

CWE-284 CVSS:3.1/PR:L Reported by Starpaul20 MyBB Team

Low risk

Announcements HTML filter bypass

CWE-79 CVSS:3.1/PR:L

Low risk

Language Pack Properties XSS

CWE-79 CVSS:3.1/PR:H Reported by Julian Rittweger

Issues Resolved (62)

View issues on GitHub

Changed Files ()

Removed Files ()

Changed Language Files (18)

There are changes to 18 language file(s). Changed languages files can be cross-referenced from the list above.

Changed Templates (63)

  • calendar
  • calendar_nextlink
  • calendar_prevlink
  • calendar_weekview
  • calendar_weekview_nextlink
  • calendar_weekview_prevlink
  • editpost
  • footer
  • forumdisplay_inlinemoderation
  • forumdisplay_thread
  • headerinclude
  • managegroup
  • member_profile_website
  • member_register
  • member_register_regimage_recaptcha_invisible
  • member_resetpassword
  • misc_whoposted_page
  • modcp_announcements_allowhtml
  • modcp_announcements_edit
  • modcp_announcements_new
  • modcp_finduser
  • modcp_ipsearch
  • modcp_ipsearch_results_information
  • modcp_modlogs
  • modcp_reports
  • modcp_reports_report
  • modcp_reports_selectall
  • moderation_delayedmoderation_approve
  • moderation_delayedmoderation_delete
  • moderation_delayedmoderation_openclose
  • moderation_delayedmoderation_softdeleterestore
  • moderation_delayedmoderation_stick
  • mycode_url
  • newreply
  • newthread
  • post_captcha
  • post_captcha_recaptcha_invisible
  • postbit
  • postbit_classic
  • postbit_deleted_member
  • postbit_editreason
  • postbit_status
  • postbit_www
  • printthread
  • private
  • private_advanced_search
  • private_search_results
  • search_results_inlinemodcol_empty
  • search_results_posts_inlinemoderation
  • search_results_posts_post
  • search_results_threads_inlinemoderation
  • search_results_threads_thread
  • showteam_moderators
  • showteam_moderators_forum
  • showthread
  • showthread_inlinemoderation
  • showthread_similarthreads_bit
  • usercp_attachments
  • usercp_latest_subscribed_threads
  • usercp_latest_threads_threads
  • usercp_subscriptions
  • usercp_subscriptions_thread
  • video_twitch_embed