Stored XSS via unescaped closed-message setting
Published Aug 30, 2021 · Updated Aug 3, 2024
Stored XSS in Maarten Belmans Business Hours Indicator before 2.3.5 allows remote authenticated users to run script in visitors' browsers. The "Now closed message" setting stores HTML without sanitization and renders it without escaping in administrative and shortcode output. Administrator access to plugin settings is required, and the script runs when a visitor opens rendered hours or an administrator reloads the settings page.
Summary
What happened
Stored XSS in Maarten Belmans Business Hours Indicator before 2.3.5 allows remote authenticated users to run script in visitors' browsers. The "Now closed message" setting stores HTML without sanitization and renders it without escaping in administrative and shortcode output. Administrator access to plugin settings is required, and the script runs when a visitor opens rendered hours or an administrator reloads the settings page.
The record
- CVE
- CVE-2021-24593
- Published
- Aug 30, 2021
- Updated
- Aug 3, 2024
- Vendor
- Maarten Belmans
- Product
- Business Hours Indicator
- Classifications
- CWE-79, T1059.007
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Aug 30, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2.3.5 <2.3.5
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- WPScan stored-XSS proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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