CVE-2026-4337: Unrestricted Upload of File with Dangerous Type vulnerability in the PuMuKIT application allows a unauthentica

Routine

HIGH 8.8REMOTE

CVE-2026-4337 is a high-severity flaw (CVSS 8.8) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Unrestricted Upload of File with Dangerous Type vulnerability in the PuMuKIT application allows a unauthenticated user to upload any type of file to the server, and to any path where the web server user has write permissions. This could also allow them to delete files.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	n/a
CISA exploited list	No
Weakness	CWE-434
Published	2026-10-27
Last modified	2026-10-27

Publisher (CNA): Spanish National Cybersecurity Institute, S.A. (INCIBE)

Last updated 2026-10-27 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

2026-10-27 12:17 UTCPublished CVE record published
2026-10-27 15:02 UTCUpdated Record last modified

Advisories and coverage

Official advisories

INCIBE-CERT Spain: Carga sin restricciones de archivos en la aplicación PuMuKIT 2026-10-27

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-4337?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-4337 being exploited?

CVE-2026-4337 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-4337 affect?

CVE-2026-4337 affects affected software. Severity is high (CVSS 8.8). Unrestricted Upload of File with Dangerous Type vulnerability in the PuMuKIT application allows a unauthenticated user to upload any type of file to the server, and to any path where the web server user has write permissions. This could als

How urgent is CVE-2026-4337?

Priority 36/100. High severity; Remotely exploitable, no login, no user action

References

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