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WordPress Plugin Vulnerabilities

Helpful < 4.4.59 - Admin+ Stored Cross-Site Scripting

Description

The plugin does not sanitise and escape some of its settings, which could allow high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed

Proof of Concept

Put the following payload in the System > Miscellaneous > Custom Timezone setting of the plugin: "><details open ontoggle="alert(/XSS/)">
The XSS will be triggered when viewing the settings page

Put the following payload "><details open ontoggle="alert(/XSS/)"> in Texts > Before Voting / After Voting / Answer Buttons / Admin Columns > Feedback settings
The XSS will be triggered when viewing a post/page where with the Helpful Widget is displayed, or after a vote depending on the vulnerable field/s used

Put the following payload in the Feedback > Messages: "><details open ontoggle="alert(/XSS/)">

The plugin fixes from 4.4.56 to 4.4.58 were insufficient as not escaping data when output in attributes, allowing for payloads such as " style=animation-name:rotation onanimationstart=alert(/XSS/)// 

Affects Plugins

helpful
Fixed in version 4.4.59

References

CVE
CVE-2021-24841
URL
https://mikadmin.fr/tech/XSS-Stored-Helpful-5b10bc7f40ab319f9797eb4abad4f420660.pdf

Classification

Type

XSS

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

Miscellaneous

Original Researcher

Mika

Submitter

Mika

Submitter website
https://mikadmin.fr/
Submitter twitter
mika_sec
Verified

Yes

WPVDB ID
55d11acf-8c47-40da-be47-24f74fd7566e

Timeline

Publicly Published

2021-10-18 (about 1 years ago)

Added

2021-10-18 (about 1 years ago)

Last Updated

2022-04-09 (about 1 years ago)

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