CVE-2023-0541: GS Books Showcase < 1.3.1 - Contributor+ Stored XSS

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-02-21 · updated 2026-06-17

Description

The GS Books Showcase WordPress plugin before 1.3.1 does not validate and escape some of its shortcode attributes before outputting them back in a page/post where the shortcode is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks.

Affected products

GS Books Showcase: before 1.3.1 — fixed in 1.3.1

How to fix

Upgrade to a fixed version: GS Books Showcase 1.3.1. Check the vendor advisory for mitigations.

References

https://wpscan.com/vulnerability/8453e587-cc8c-491a-af09-fc4ab215134b
https://wpscan.com/vulnerability/8453e587-cc8c-491a-af09-fc4ab215134b

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