CVE-2020-35937

Team Showcase <= 1.22.15 - Stored Cross-Site Scripting

2020-09-17 00:00

Strategic Overview

Status: Patched in 1.22.16
Affected Plugin: Team Showcase
Affected Version: < 1.22.16
CVSS: 7.5High
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2020-35937

At a glance

CVE-2020-35937 is a high-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Team Showcase WordPress plugin, affecting versions < 1.22.16. It carries a CVSS score of 7.5 (reachable over the network; high confidentiality, integrity, availability impact). The issue is fixed in version 1.22.16; sites on affected versions should update now. Disclosed September 2020, reported by Ram.

Vulnerability Overview

Stored Cross-Site Scripting (XSS) vulnerabilities in the Team Showcase plugin before 1.22.16 for WordPress allow remote authenticated attackers to import layouts including JavaScript supplied via a remotely hosted crafted payload in the source parameter via AJAX. The action must be set to team_import_xml_layouts.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, and no interaction from a victim user. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.

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

Reaching this weakness in Team Showcase < 1.22.16 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 Team Showcase the fix is 1.22.16: builds < 1.22.16 are affected, anything from 1.22.16 onward is not.

Remediation

Update to version 1.22.16, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Team Showcase: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Team Showcase 1.22.16 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2020-35937 https://www.wordfence.com/threat-intel/vulnerabilities/id/52bb3328-956c-4379-879a-d321d68c39ee https://nvd.nist.gov/vuln/detail/CVE-2020-35937

Related records

Same weakness class

Other vulnerabilities in Team Showcase

CVSS Vector

7.5

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

Base

Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

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