UBUNTU-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 Information vulnerability. The logic instructs caches not to cache...

PYSEC-2026-2151

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 Information vulnerability. The logic instructs caches not to cache...

CVE-2026-27205

CVE-2026-27205 – Flask cache-related information disclosure (root cause: Vary: Cookie not set when session accessed) Affected: Flask 3.1.2 and below. In these versions, accessing the session object may cause a response to be cached with user-specific data, as the Vary: Cookie header is not consis...

CVE-2026-27205 Flask session does not add `Vary: Cookie` header when accessed in some ways

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 Information vulnerability. The logic instructs caches not to cache...

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 Information vulnerability. The logic instructs caches not to cache...

CVE-2026-27205 Flask session does not add `Vary: Cookie` header when accessed in some ways

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 Information vulnerability. The logic instructs caches not to cache...

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 Information vulnerability. The logic instructs caches not to cache...

CVE-2026-27205 Flask session does not add `Vary: Cookie` header when accessed in some ways

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 Information vulnerability. The logic instructs caches not to cache...

CVE-2026-27205: Use of Cache Containing Sensitive Information

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 Information vulnerability. The logic instructs caches not to cache...

Flask 安全漏洞

Flask is a Python micro-framework developed by Pallets, used for building web applications. Versions of Flask prior to 3.1.2 have a security vulnerability caused by an improper setting of the Vary header when accessing session objects. This vulnerability may lead to the use of cache containing...

Linux Distros Unpatched Vulnerability : CVE-2026-27205

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - 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...

GHSA-68RP-WP8R-4726 Flask session does not add `Vary: Cookie` header when accessed in some ways

When the session object is accessed, Flask should set the Vary: Cookie header. This instructs caches not to cache the response, as it may contain information specific to a logged in user. This is handled in most cases, but some forms of access such as the Python in operator were overlooked. The...

Use of Cache Containing Sensitive Information

Overview Affected versions of this package are vulnerable to Use of Cache Containing Sensitive Information in the session object. An attacker can cause sensitive user-specific responses to be cached and served to other users by leveraging a caching proxy that does not ignore responses with cookie...

Flask session does not add `Vary: Cookie` header when accessed in some ways

When the session object is accessed, Flask should set the Vary: Cookie header. This instructs caches not to cache the response, as it may contain information specific to a logged in user. This is handled in most cases, but some forms of access such as the Python in operator were overlooked. The...

web-vuln-scanner

web-vuln-scanner A Python-based web vulnerabili...

PYSEC-2026-2181

Indico is an event management system that uses Flask-Multipass, a multi-backend authentication system for Flask. Versions prior to 3.3.10 are vulnerable to server-side request forgery. Indico makes outgoing requests to user-provides URLs in various places. This is mostly intentional and part of...

CVE-2026-25738: Time-of-check Time-of-use (TOCTOU) Race Condition

Indico is an event management system that uses Flask-Multipass, a multi-backend authentication system for Flask. Versions prior to 3.3.10 are vulnerable to server-side request forgery. Indico makes outgoing requests to user-provides URLs in various places. This is mostly intentional and part of...

CVE-2026-25739: Improper Neutralization of Input During Web Page Generation

Indico is an event management system that uses Flask-Multipass, a multi-backend authentication system for Flask. Versions prior to 3.3.10 are vulnerable to cross-site scripting when uploading certain file types as materials. Users should upgrade to version 3.3.10 to receive a patch. To apply the...

PT-2026-21353

Name of the Vulnerable Software and Affected Versions Flask versions 3.1.2 and below Description Flask, a web server gateway interface WSGI web application framework, may improperly handle caching when accessing the session object. Specifically, it may fail to set the 'Vary: Cookie' header,...

Flask session does not add `Vary: Cookie` header when accessed in some ways

When the session object is accessed, Flask should set the Vary: Cookie header. This instructs caches not to cache the response, as it may contain information specific to a logged in user. This is handled in most cases, but some forms of access such as the Python in operator were overlooked. The...