CVE-2026-19862 json
JetFormBuilder < 3.6.5.2 - Unauthenticated Email Header Injection via Send Email Action
published 2026-09-06 2 mo ago modified 2026-09-08 2 mo ago also EUVD-2026-72090
- cvss
- 4.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 15%
- public exploits
- 0
- none known
Summary
The JetFormBuilder WordPress plugin before 3.6.5.2 does not validate or strip line breaks from address values it sources from submitted form fields before adding them to the headers of the e-mails it sends, allowing unauthenticated users to inject arbitrary e-mail headers, add hidden recipients and spoof the sender. Exploitation requires the site to be configured to take one of the message's addresses from a form field.
Patch / fix
- Unknown JetFormBuilder 3.6.5.2
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- wpscan.com https://wpscan.com/vulnerability/b3fe5552-6736-4479-9c61-c05bc3328b8e/ referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N |
Affected products
- Unknown JetFormBuilder
Classification
- Weakness
-
- CWE-93 Improper Neutralization of CRLF Sequences
- Technology feeds
References
-
wpscan.com
/vulnerability/b3fe5552-6736-4479-9c61-c05bc3328b8e/
exploit, vdb-entry, technical-description
Sources
- CVE List CVE-2026-19862
- NVD CVE-2026-19862
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.