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Fencer Intel
medium 5.5

CVE-2026-19860 json

JetFormBuilder 3.5.6.2 - 3.6.5.2 - Admin+ Arbitrary File Deletion via Server-Side Validation Callback

published last mo. modified last mo. also EUVD-2026-83499

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits
0
none known

Summary

The JetFormBuilder — Dynamic Blocks Form Builder WordPress plugin before 3.6.5.3 does not sufficiently restrict which PHP functions can be used as a custom field-validation callback, relying on a blocklist that omits a file-deletion function, allowing users able to manage forms to cause arbitrary files on the server to be deleted. The deletion itself is carried out when the form is submitted, which requires no authentication.

Patch / fix

  • Unknown JetFormBuilder — Dynamic Blocks Form Builder 3.6.5.3

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
last mo.

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • wpscan.com https://wpscan.com/vulnerability/d73d8d27-6dad-4a7f-bf51-f5fc18ebc81f/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.5 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:L
CNA 3.1 5.5 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:L

Affected products

  • Unknown JetFormBuilder — Dynamic Blocks Form Builder

Classification

Weakness
  • CWE-73 External Control of File Name or Path
Technology feeds

References

Sources

Fencer Intel 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.