CVE-2026-49471

Serena is a powerful MCP toolkit for coding that provides semantic retrieval and editing capabilities. Prior to v1.5.2, Serena's built-in web dashboard exposes an unauthenticated Flask API on a fixed, predictable port, with no authentication, no CSRF protection, and no Host header validation. A D...

CVE-2026-49471 Serena: Unauthenticated Flask dashboard on fixed port enables DNS rebinding → memory poisoning → RCE

Serena is a powerful MCP toolkit for coding that provides semantic retrieval and editing capabilities. Prior to v1.5.2, Serena's built-in web dashboard exposes an unauthenticated Flask API on a fixed, predictable port, with no authentication, no CSRF protection, and no Host header validation. A D...

CVE-2026-49471 Serena: Unauthenticated Flask dashboard on fixed port enables DNS rebinding → memory poisoning → RCE

Serena is a powerful MCP toolkit for coding that provides semantic retrieval and editing capabilities. Prior to v1.5.2, Serena's built-in web dashboard exposes an unauthenticated Flask API on a fixed, predictable port, with no authentication, no CSRF protection, and no Host header validation. A D...

Fugue is Vulnerable to Remote Code Execution by Pickle Deserialization via FlaskRPCServer

SummaryThe Fugue framework implements an RPC server system for distributed computing operations. In the corefunctionality of the RPC server implementation, Ifound thatthedecodefunction infugue/rpc/flask.pydirectly usescloudpickle.loadsto deserialize datawithout any sanitization. This creates a...

PYSEC-2026-1399 Fugue is Vulnerable to Remote Code Execution by Pickle Deserialization via FlaskRPCServer

Summary The Fugue framework implements an RPC server system for distributed computing operations. In the core functionality of the RPC server implementation, I found that the decode function in fugue/rpc/flask.py directly uses cloudpickle.loads to deserialize data without any sanitization. This...

Flask App Builder has an Authentication Bypass vulnerability when using non AUTH_DB methods

ImpactWhen Flask-AppBuilder is configured to use OAuth, LDAP, or other non-database authentication methods, the password reset endpoint remains registered and accessible, despite not being displayed in the user interface. This allows an enabled user to reset their password and be able to create J...

PYSEC-2026-1378 Flask App Builder has an Authentication Bypass vulnerability when using non AUTH_DB methods

Impact When Flask-AppBuilder is configured to use OAuth, LDAP, or other non-database authentication methods, the password reset endpoint remains registered and accessible, despite not being displayed in the user interface. This allows an enabled user to reset their password and be able to create...

PYSEC-2026-1377 Flask uses fallback key instead of current signing key

In Flask 3.1.0, the way fallback key configuration was handled resulted in the last fallback key being used for signing, rather than the current signing key. Signing is provided by the itsdangerous library. A list of keys can be passed, and it expects the last top key in the list to be the most...

Flask-AppBuilder open redirect vulnerability using HTTP host injection

ImpactFlask-AppBuilder prior to 4.6.2 would allow for a malicious unauthenticated actor to perform an open redirect by manipulating the Host header in HTTP requests. PatchesFlask-AppBuilder 4.6.2 introduced the FABSAFEREDIRECTHOSTS configuration variable, which allows administrators to explicitly...

Flask uses fallback key instead of current signing key

In Flask 3.1.0, the way fallback key configuration was handled resulted in the last fallback key being used for signing, rather than the current signing key.Signing is provided by the itsdangerous library. A list of keys can be passed, and it expects the last top key in the list to be the most...

PYSEC-2026-1379 Flask-AppBuilder open redirect vulnerability using HTTP host injection

Impact Flask-AppBuilder prior to 4.6.2 would allow for a malicious unauthenticated actor to perform an open redirect by manipulating the Host header in HTTP requests. Patches Flask-AppBuilder 4.6.2 introduced the FABSAFEREDIRECTHOSTS configuration variable, which allows administrators to explicit...

PYSEC-2026-1385 Flask-CORS allows for inconsistent CORS matching

A vulnerability in corydolphin/flask-cors version 5.0.1 allows for inconsistent CORS matching due to the handling of the '+' character in URL paths. The request.path is passed through the unquoteplus function, which converts the '+' character to a space ' '. This behavior leads to incorrect path...

Flask-CORS improper regex path matching vulnerability

corydolphin/flask-cors version 5.0.1 contains an improper regex path matching vulnerability. The plugin prioritizes longer regex patterns over more specific ones when matching paths, which can lead to less restrictive CORS policies being applied to sensitive endpoints. This mismatch in regex...

Flask-CORS vulnerable to Improper Handling of Case Sensitivity

corydolphin/flask-cors version 5.0.1 contains a vulnerability where the request path matching is case-insensitive due to the use of the trymatch function, which is originally intended for matching hosts. This results in a mismatch because paths in URLs are case-sensitive, but the regex matching...

PYSEC-2026-1384 Flask-CORS improper regex path matching vulnerability

corydolphin/flask-cors version 5.0.1 contains an improper regex path matching vulnerability. The plugin prioritizes longer regex patterns over more specific ones when matching paths, which can lead to less restrictive CORS policies being applied to sensitive endpoints. This mismatch in regex...

PYSEC-2026-1383 Flask-CORS vulnerable to Improper Handling of Case Sensitivity

corydolphin/flask-cors version 5.0.1 contains a vulnerability where the request path matching is case-insensitive due to the use of the trymatch function, which is originally intended for matching hosts. This results in a mismatch because paths in URLs are case-sensitive, but the regex matching...

pyspider Cross-Site Request Forgery (CSRF) via the Flask endpoints

binux pyspider up to v0.3.10 was discovered to contain a Cross-Site Request Forgery CSRF via the Flask endpoints...

PYSEC-2026-1842 pyspider Cross-Site Request Forgery (CSRF) via the Flask endpoints

binux pyspider up to v0.3.10 was discovered to contain a Cross-Site Request Forgery CSRF via the Flask endpoints...

Flask-AppBuilder's login form allows browser to cache sensitive fields

ImpactAuth DB login form default cache directives allows browser to locally store sensitive data. This can be an issue on environments using shared computer resources. PatchesUpgrade flask-appbuilder to version 4.5.1 WorkaroundsIf upgrading is not possible configure your web server to send the...

PYSEC-2026-1382 Flask-AppBuilder's login form allows browser to cache sensitive fields

Impact Auth DB login form default cache directives allows browser to locally store sensitive data. This can be an issue on environments using shared computer resources. Patches Upgrade flask-appbuilder to version 4.5.1 Workarounds If upgrading is not possible configure your web server to send the...