CVE-2021-24793

WPeMatico RSS Feed Fetcher <= 2.6.11 - Admin+ Stored Cross-Site Scripting

2021-09-29 00:00

Strategic Overview

Status: Patched in 2.6.12
Affected Plugin: WPeMatico RSS Feed Fetcher
Affected Version: < 2.6.12
CVSS: 5.5Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2021-24793

View all WPeMatico RSS Feed Fetcher vulnerabilities

At a glance

CVE-2021-24793 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the WPeMatico RSS Feed Fetcher WordPress plugin, affecting versions < 2.6.12. It carries a CVSS score of 5.5 (reachable over the network; low attack complexity). The issue is fixed in version 2.6.12; sites on affected versions should update now. Disclosed September 2021, reported by Huy Nguyen.

Vulnerability Overview

The WPeMatico RSS Feed Fetcher WordPress plugin before 2.6.12 does not escape the Feed URL added to a campaign before outputting it in an attribute, allowing high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed.

Technical Analysis

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

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

Reaching this weakness in WPeMatico RSS Feed Fetcher < 2.6.12 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 WPeMatico RSS Feed Fetcher the fix is 2.6.12: builds < 2.6.12 are affected, anything from 2.6.12 onward is not.

Remediation

Update to version 2.6.12, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to WPeMatico RSS Feed Fetcher: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: WPeMatico RSS Feed Fetcher 2.6.12 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24793 https://www.wordfence.com/threat-intel/vulnerabilities/id/a62a3a71-0dbb-48d6-ba1a-f218fefac871 https://nvd.nist.gov/vuln/detail/CVE-2021-24793

Related records

Same weakness class

Other vulnerabilities in WPeMatico RSS Feed Fetcher

CVSS Vector

5.5

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredHigh
User InteractionNone
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone

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