Vulnerability in Pallets Flask
CVE-2026-27205
Flask is a web server gateway interface (WSGI) web application framework. In versions 3.1.2 and below, when the session object is accessed, Flask should set the Vary: Cookie header., resulting in a Use of Cache Containing Sensitive Informa…
EPSS: 0.000 (2.7th percentile) — read the EPSS interpretation.
Affected products
- Pallets Flask — versions < 3.1.3
Weakness classification (CWE)
References
- https://github.com/pallets/flask/security/advisories/GHSA-68rp-wp8r-4726 (x_refsource_CONFIRM)
- https://github.com/pallets/flask/commit/089cb86dd22bff589a4eafb7ab8e42dc357623b4 (x_refsource_MISC)
- https://github.com/pallets/flask/releases/tag/3.1.3 (x_refsource_MISC)