TI-2026-22023 Aliases CVE-2026-27641 GHSA-65mp-fq8v-56jr

Flask-Reuploaded vulnerable to Remote Code Execution via Server-Side Template Injection

MEDIUM 52CWE-1336Published 2026-02-25 · Updated 2026-02-25

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-1336.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.01337 71st percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed flask-reuploaded (jugmac00): 1.5.0flask-reuploaded (PyPI): 1.5.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
jugmac00	flask-reuploaded	before 1.5.0	1.5.0	Patch available	CNA
—	flask-reuploaded (PyPI)	before 1.5.0	1.5.0	Patch available	GHSA-65mp-fq8v-56jr

flask-reuploaded Vendorjugmac00 Affected before 1.5.0 Fixed in 1.5.0 Patch available CNA
flask-reuploaded (PyPI) Vendor— Affected before 1.5.0 Fixed in 1.5.0 Patch available GHSA-65mp-fq8v-56jr

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:jugmac00:flask-reuploaded::::::python::*	before 1.5.0	Vulnerable	jugmac00

cpe:2.3:a:jugmac00:flask-reuploaded:*:*:*:*:*:python:*:* Versions before 1.5.0 Vulnerable ·jugmac00

Remediation

Fix · CNA flask-reuploaded (jugmac00) Fixed in 1.5.0
Fix · GHSA-65mp-fq8v-56jr flask-reuploaded (PyPI) Fixed in 1.5.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-27641
2026-10-03 Alias added: GHSA-65mp-fq8v-56jr

References

Exploit 1

https://github.com/jugmac00/flask-reuploaded/security/advisories/GHSA-65mp-fq8v-56jr

Patch 2

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-27641

Other 3

Sources

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