CVE-2022-0958

Mark Posts <= 2.0.0 - Admin+ Stored Cross-Site Scripting

2022-03-14 00:00

Strategic Overview

Status: Patched in 2.0.1
Affected Plugin: Mark Posts
Affected Version: < 2.0.1
CVSS: 4.8Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2022-0958

At a glance

CVE-2022-0958 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Mark Posts WordPress plugin, affecting versions < 2.0.1. It carries a CVSS score of 4.8 (reachable over the network; low attack complexity). The issue is fixed in version 2.0.1; sites on affected versions should update now. Disclosed March 2022, reported by fuzzyap1.

Vulnerability Overview

The Mark Posts WordPress plugin before 2.0.1 does not escape new markers, allowing high privilege users such as admin 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.

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

Reaching this weakness in Mark Posts < 2.0.1 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 Mark Posts the fix is 2.0.1: builds < 2.0.1 are affected, anything from 2.0.1 onward is not.

Remediation

Update to version 2.0.1, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Mark Posts: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Mark Posts 2.0.1 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2022-0958 https://www.wordfence.com/threat-intel/vulnerabilities/id/33df558a-da81-46e0-bef9-ddb2bb90a5c5 https://nvd.nist.gov/vuln/detail/CVE-2022-0958

Related records

CVSS Vector

4.8

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

Base

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

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