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AUSCERT Security Bulletin
WordPress 5.3.1 Security and Maintenance Release
2 January 2020
AusCERT Security Bulletin Summary
Operating System: UNIX variants (UNIX, Linux, OSX)
Impact/Access: Cross-site Scripting -- Remote with User Interaction
Unauthorised Access -- Remote/Unauthenticated
Member content until: Wednesday, January 15 2020
Comment: This advisory references vulnerabilities in products which run on
platforms other than UNIX variants (UNIX, Linux, OSX) or Windows. It
is recommended that administrators running wordpress check for an
updated version of the software for their operating system.
Revision History: January 2 2020: Aligned XSS impact to require user interaction
December 16 2019: Initial Release
A number of vulnerabilities have been identified in WordPress prior
to version 5.3.1. 
The vendor has provided the following details regarding these
"Four security issues affect WordPress versions 5.3 and earlier; version 5.3.1
fixes them, so you'll want to upgrade. If you haven't yet updated to 5.3, there
are also updated versions of 5.0 and earlier that fix the security issues.
o Props to Daniel Bachhuber for finding an issue where an unprivileged user
could make a post sticky via the REST API.
o Props to Simon Scannell of RIPS Technologies for finding and disclosing an
issue where cross-site scripting (XSS) could be stored in well-crafted
o Props to the WordPress.org Security Team for hardening wp_kses_bad_protocol
() to ensure that it is aware of the named colon attribute.
o Props to Nguyen The Duc for discovering a stored XSS vulnerability using
block editor content." 
The vendor recommends updating to version 5.3.1 of WordPress to
correct these issues. 
 WordPress 5.3.1 Security and Maintenance Release
AusCERT has made every effort to ensure that the information contained
in this document is accurate. However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.
Australian Computer Emergency Response Team
The University of Queensland
Internet Email: firstname.lastname@example.org
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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