CVE-2022-4650: HashBar – WordPress Notification Bar < 1.3.6 - Contributor+ Stored XSS via Shortcode

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-01-23 · updated 2026-06-17
Weakness: CWE-79

Description

The HashBar WordPress plugin before 1.3.6 does not validate and escape one of its shortcode attributes, which could allow users with a role as low as contributor to perform Stored Cross-Site Scripting attack.

Affected products

HashBar: before 1.3.6 — fixed in 1.3.6

How to fix

Upgrade to a fixed version: HashBar 1.3.6. Check the vendor advisory for mitigations.

References

https://wpscan.com/vulnerability/b430fdaa-191a-429e-b6d2-479b32bb1075
https://wpscan.com/vulnerability/b430fdaa-191a-429e-b6d2-479b32bb1075

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