CVE-2026-54567 Flask-Reuploaded - Unrestricted File Upload

Flask-Reuploaded 1.5.0 to <1.6.0 contains a file upload vulnerability caused by inconsistent extension case handling in UploadSet.save, letting attackers bypass lowercase denylist and upload executable files, exploit requires denylist configuration and user-controlled filename.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.63% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Unrestricted File Upload
Impact
Remote Code Execution, Information Disclosure, Data Tampering, Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
14 September 2026
Updated
15 October 2026
Weakness
CWE-178

Vendor fix

Update to version 1.6.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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