Email spoofing via unsanitized address line breaks
Published Sep 6, 2026 · Updated Sep 6, 2026
Email header injection in Crocoblock JetFormBuilder before 3.6.5.2 allows remote attackers to add recipients or spoof senders. The Send Email action copies address values from submitted form fields into message headers without validating or removing CRLF sequences. Exploitation requires a form whose Send Email action sources an address from a submitted field, and resulting mail can carry attacker-selected headers or hidden recipients.
Summary
What happened
Email header injection in Crocoblock JetFormBuilder before 3.6.5.2 allows remote attackers to add recipients or spoof senders. The Send Email action copies address values from submitted form fields into message headers without validating or removing CRLF sequences. Exploitation requires a form whose Send Email action sources an address from a submitted field, and resulting mail can carry attacker-selected headers or hidden recipients.
The record
- CVE
- CVE-2026-19862
- Published
- Sep 6, 2026
- Updated
- Sep 6, 2026
- Vendor
- Crocoblock
- Product
- JetFormBuilder
- Classifications
- CWE-93, T1036
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 6, 2026CVE publishedPublication date reported by the CVE source.
- Sep 6, 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 <3.6.5.2
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
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Technologies
Your stack
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Your stack
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