CVE-2018-16164

EventCalendar <= 1.1.21 - Cross-Site Scripting

2018-11-02 00:00

Strategic Overview

Status: Patched in 1.1.22
Affected Plugin: Event Calendar WD version
Affected Version: <= 1.1.21
CVSS: 5.4Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2018-16164

View all Event Calendar WD version vulnerabilities

At a glance

CVE-2018-16164 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Event Calendar WD version WordPress plugin, affecting versions <= 1.1.21. It carries a CVSS score of 5.4 (reachable over the network; low attack complexity). The issue is fixed in version 1.1.22; sites on affected versions should update now. Disclosed November 2018, reported by Yuta Kitaoka.

Vulnerability Overview

Cross-site scripting vulnerability in Event Calendar WD version 1.1.21 and earlier allows remote authenticated attackers to inject arbitrary web script or HTML via unspecified vectors.

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 Event Calendar WD version <= 1.1.21 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 Event Calendar WD version the fix is 1.1.22: builds <= 1.1.21 are affected, anything from 1.1.22 onward is not.

Remediation

Update to version 1.1.22, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Event Calendar WD version: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Event Calendar WD version 1.1.22 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2018-16164 https://www.wordfence.com/threat-intel/vulnerabilities/id/f3a5bb9c-0fc3-4a1b-8b4d-a700cbf9dacc https://nvd.nist.gov/vuln/detail/CVE-2018-16164

Related records

Same weakness class

Other vulnerabilities in Event Calendar WD version

4.3CVE-2021-25025: Event Calendar <= 1.1.50 Subscriber+ Event CreationCVE-2021-25025

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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