Tatsu <= 3.3.12 - Unauthenticated Remote Code Execution

Unrestricted Upload of File with Dangerous Type
CVE CVE-2021-25094
CVSS 6.5 (Medium)
Publicly Published March 28, 2022
Last Updated November 18, 2022
Researcher Vincent MICHEL


The Tatsu WordPress plugin before 3.3.13 add_custom_font action can be used without prior authentication to upload a rogue zip file which is uncompressed under the WordPress's upload directory. By adding a PHP shell with a filename starting with a dot ".", this can bypass extension control implemented in the plugin. Moreover, there is a race condition in the zip extraction process which makes the shell file live long enough on the filesystem to be callable by an attacker.

Wordfence blocked 5,013 attacks targeting this vulnerability in the past 24 hours.



1 affected software package

Software Type Plugin
Software Slug tatsu
Patched? Yes
Remediation Update to version 3.3.13, or a newer patched version
Affected Version
  • <= 3.3.12
Patched Version
  • 3.3.13

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