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CVE-2026-27641

Jugmac00 Flask-reuploaded remote code execution

9.8 CRITICALPublic exploitEPSS 1.24%
  1. Published25 Feb 2026

Description

Flask-Reuploaded provides file uploads for Flask. A critical path traversal and extension bypass vulnerability in versions prior to 1.5.0 allows remote attackers to achieve arbitrary file write and remote code execution through Server-Side Template Injection (SSTI). Flask-Reuploaded has been patched in version 1.5.0. Some workarounds are available. Do not pass user input to the `name` parameter, use auto-generated filenames only, and implement strict input validation if `name` must be used.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Jugmac00 Flask-reuploaded< 1.5.0

Remediation

Fixed in
Jugmac00 Flask-reuploaded≥ 1.5.0

References

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Frequently asked

Is CVE-2026-27641 being actively exploited?

CVE-2026-27641 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.24%.

How severe is CVE-2026-27641?

CVE-2026-27641 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 1.24% probability of exploitation.

Which products are affected by CVE-2026-27641?

Affected products include Jugmac00 Flask-reuploaded.

How do I fix CVE-2026-27641?

Upgrade affected software to a fixed version, for example Jugmac00 Flask-reuploaded 1.5.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-27641 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.