CVE-2026-56291: in the CISA KEV catalogue

Balbooa Forms Unrestricted Upload of File with Dangerous Type Vulnerability. CISA added CVE-2026-56291 to the Known Exploited Vulnerabilities catalogue on 2026-07-10 with a default due date of 2026-07-13. Known ransomware campaign use: Unknown. Forensic triage flag: Yes.

Balbooa Forms contains an unrestricted upload of file with dangerous type vulnerability that allows an unauthenticated arbitrary file upload which could allow uploading of executable files leading to full RCE. (CISA description)

Vendor / product: Balbooa Forms
CWE: CWE-434
CISA required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
EPSS: 15%, percentile 96 (scored 2026-11-03)

EPSS puts about 15 in 100 odds (15%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 96% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.

Vendor and reference links (from CISA)

Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.

Data dates. CISA KEV catalogue version 2026.11.03, released 2026-11-03, 1,767 entries (checked 2026-11-03). EPSS model v2026.06.15, scored 2026-11-03, 399,388 CVEs. Sources: CISA and FIRST (EPSS by FIRST; scores generated by Empirical Security). Copied to our own database and refreshed automatically; if a refresh fails, the previous copy keeps serving with its own date.

Frequently asked questions

Is CVE-2026-56291 in the CISA KEV catalogue?

Yes. CISA added CVE-2026-56291 (Balbooa Forms Unrestricted Upload of File with Dangerous Type Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2026-07-10. CISA's default due date for it is 2026-07-13.

Is CVE-2026-56291 used in ransomware attacks?

CISA marks known ransomware campaign use as Unknown for CVE-2026-56291. That means CISA lacks confirmation, not that ransomware groups do not use it.

What should I do about CVE-2026-56291?

CISA's required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Sources

CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
NVD record for CVE-2026-56291