MyBB 1.8.39

02 June 2025

SecurityMaintenance

code 1839

Full Package

Install a new MyBB forum or upgrade from older versions.

.zip – 2.21 MB

Download from MyBB.com Download from GitHub.com (mirror)

sha512:

7266fb1613adbe0d652497aa189fb1ab5d80fe7da7182c4365dd54f71c0f3248b750400a5049f2a63ab18df2ea4a7fad981ba7f3a1b24e5760adea76d1a527ca

More checksums…

sha256:

04537bc28d924454dbbe6206962a122b3c5c20ffa3b94bec4f5c654a9d01c2cf

sha1:

21aa5a68afeca60d5d4d40a3d006e5122015b3a9

md5:

e9323162ee534d56cad75d2b78cdc081

Changed Files

Upgrade from the previous version.

.zip – 0.68 MB

Download from MyBB.com Download from GitHub.com (mirror)

sha512:

63e739e0cedbc565c54abf1989d1215b5f7fdb1df5b07a5a36a6b0de52af76bc1855dccc0c371d5c8c8fde0f81833365e86ebd61b23e47fd197a58d9459acae5

More checksums…

sha256:

f61e28efffc48601a70bbc0403ea5819b9e44cad65d36edbe9012f596285b49e

sha1:

f71072066ba72edec7313edb430d22d4966cd335

md5:

0b51852769fda6908f1c5e007d785c70

How to verify packages

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 (2)

Medium risk

Upgrade local file inclusion [1]

CWE-22 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H CVE-2025-48940 Reported by Cillian Collins

Low risk

Unviewable threads title disclosure in search [1]

CWE-1230 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N CVE-2025-48941 Reported by Huseyn (Khatai) Gadashov Exploit Azerbaijan

Issues Resolved (37)

View issues on GitHub

Changed Files ()

Changed Language Files (6)

There are changes to 6 language file(s). Changed languages files can be cross-referenced from the list above.

Changed Templates (5)

member_profile_contact_details
memberlist_search
modcp_editprofile
printthread_multipage
usercp_profile_contact_fields