Stored XSS via hex-escaped sender name
Published Jan 21, 2026 · Updated Jan 21, 2026
Stored XSS in the SMTP Contact plugin for GetSimple CMS 1.1.2 allows remote authenticated users to execute script in an administrator's browser. The settings handler stores the m_smtp_c_sender_name value after htmlspecialchars(), but JavaScript hex escapes survive filtering and decode into markup when rendered. A low-privileged authenticated user must save the crafted setting, and script execution requires an administrator to load the affected interface; the script can act with that session.
Summary
What happened
Stored XSS in the SMTP Contact plugin for GetSimple CMS 1.1.2 allows remote authenticated users to execute script in an administrator's browser. The settings handler stores the m_smtp_c_sender_name value after htmlspecialchars(), but JavaScript hex escapes survive filtering and decode into markup when rendered. A low-privileged authenticated user must save the crafted setting, and script execution requires an administrator to load the affected interface; the script can act with that session.
The record
- CVE
- CVE-2021-47870
- Published
- Jan 21, 2026
- Updated
- Jan 21, 2026
- Vendor
- GetSimple CMS
- Product
- My SMTP Contact Plugin
- Classifications
- CWE-79, T1203
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jan 21, 2026CVE publishedPublication date reported by the CVE source.
- Jan 21, 2026Record 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=1.1.2
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
- GetSimple CMS My SMTP Contact Plugin CSRF-to-XSS exploitfunctional · demonstrated
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Technologies
Your stack
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Your stack
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