Unauthenticated shortcode execution via public form routes
Published Aug 12, 2026 · Updated Aug 12, 2026
Injection in Themeum Kirki before 6.2.1 allows remote attackers to execute registered shortcodes through public form REST routes. EmailActionHandler::send_single_email_action() applies do_shortcode() to attacker-supplied recipient, Reply-To, name, and subject fields. No login is required; a public collection request creates session-backed form metadata, and a matching form request can disclose the administrator email address or relay mail.
Summary
What happened
Injection in Themeum Kirki before 6.2.1 allows remote attackers to execute registered shortcodes through public form REST routes. EmailActionHandler::send_single_email_action() applies do_shortcode() to attacker-supplied recipient, Reply-To, name, and subject fields. No login is required; a public collection request creates session-backed form metadata, and a matching form request can disclose the administrator email address or relay mail.
The record
- CVE
- CVE-2026-16747
- Published
- Aug 12, 2026
- Updated
- Aug 12, 2026
- Vendor
- Themeum
- Product
- Kirki
- Classifications
- CWE-74, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 12, 2026CVE publishedPublication date reported by the CVE source.
- Aug 12, 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=0 <6.2.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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 two-request shortcode execution proof of conceptfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Reported exploitation
- Patchstack reported known exploitationreported exploitation
Technologies
Your stack
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Your stack
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