CVE-2021-24834

YOP Poll <= 6.3.0 - Author+ Stored Cross-Site Scripting via Options Module

2021-10-15 00:00

Strategic Overview

Status: Patched in 6.3.1
Affected Plugin: YOP Poll
Affected Version: <= 6.3.0
CVSS: 5.4Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2021-24834

At a glance

CVE-2021-24834 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the YOP Poll WordPress plugin, affecting versions <= 6.3.0. It carries a CVSS score of 5.4 (reachable over the network; low attack complexity). The issue is fixed in version 6.3.1; sites on affected versions should update now. Disclosed October 2021, reported by Vishnupriya Ilango.

Vulnerability Overview

The YOP Poll WordPress plugin before 6.3.1 is affected by a stored Cross-Site Scripting vulnerability which exists in the Create Poll - Options module where a user with a role as low as author is allowed to execute arbitrary script code within the context of the application. This vulnerability is due to insufficient validation of custom label parameters - vote button label , results link label and back to vote caption label.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed.

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Reaching this weakness in YOP Poll <= 6.3.0 takes a caller who can reach the endpoint. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For YOP Poll the fix is 6.3.1: builds <= 6.3.0 are affected, anything from 6.3.1 onward is not.

Remediation

Update to version 6.3.1, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to YOP Poll: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: YOP Poll 6.3.1 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24834 https://www.wordfence.com/threat-intel/vulnerabilities/id/7edad4f6-e470-4a72-b618-d2dad64e0ac1 https://nvd.nist.gov/vuln/detail/CVE-2021-24834

Related records

Same weakness class

Other vulnerabilities in YOP Poll

CVSS Vector

5.4

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionRequired
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone

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