Miniflux before 2.3.5 contains an unverified password change vulnerability that allows holders of a signed-in session to change the account password without supplying the current password. Attackers with a stolen session cookie or unattended device can submit new password fields via updateSettings to lock out the owner and take over the account.

Miniflux 2.3.0 through 2.3.3 contains a server-side request forgery vulnerability that allows authenticated users to reach internal addresses by setting a feed's proxyurl. Attackers can point proxyurl at loopback or internal hosts, bypassing FETCHERALLOWPRIVATENETWORKS checks to probe internal ports and send proxy-style requests to internal services.

Summary

Due to a weak Content Security Policy on the /proxy/ route, an attacker can bypass the CSP of the media proxy and execute cross-site scripting when opening external images in a new tab/window.

Impact

A malicious feed added to Miniflux can execute arbitrary JavaScript in the user's browser when opening external resources, such as proxified images, in a new tab or window.

Mitigation

The CSP for the media proxy has been changed from default-src 'self' to default-src 'none'; form-action 'none'; sandbox;.

Upgrade to Miniflux >= 2.2.7

Credit RyotaK (GMO Flatt Security Inc.) with takumi-san.ai

Miniflux before 2.3.5 contains an insufficient session expiration vulnerability that allows attackers to retain account access because password changes do not revoke existing web sessions. Attackers holding a leaked password or copied session cookie keep access for up to 30 days, reading integration credentials, creating API keys, or registering passkeys.