CVE-2019-19110

wpForo Forum <= 1.6.5 - Cross-Site Scripting via s parameter

2020-05-04 00:00

Strategic Overview

Status: Patched in 1.7.0
Affected Plugin: wpForo Forum
Affected Version: <= 1.6.5
CVSS: 4.8Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2019-19110

At a glance

CVE-2019-19110 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the wpForo Forum WordPress plugin, affecting versions <= 1.6.5. It carries a CVSS score of 4.8 (reachable over the network; low attack complexity). The issue is fixed in version 1.7.0; sites on affected versions should update now. Disclosed May 2020, reported by Sh0ckFR.

Vulnerability Overview

The wpForo plugin 1.6.5 for WordPress allows XSS via the wp-admin/admin.php?page=wpforo-phrases s parameter.

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 wpForo Forum <= 1.6.5 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 wpForo Forum the fix is 1.7.0: builds <= 1.6.5 are affected, anything from 1.7.0 onward is not.

Remediation

Update to version 1.7.0, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to wpForo Forum: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: wpForo Forum 1.7.0 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2019-19110 https://www.wordfence.com/threat-intel/vulnerabilities/id/b3c65619-e96c-47e1-b42a-a85d0b5237d9 https://nvd.nist.gov/vuln/detail/CVE-2019-19110

Related records

Same weakness class

Other vulnerabilities in wpForo Forum

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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