Readest up to 0.11.9 Stripe Integration route.ts sessionId authentication replay

Summaryinfo

A vulnerability was found in Readest up to 0.11.9. It has been classified as critical. The affected element is an unknown function of the file apps/readest-app/src/app/api/stripe/check/route.ts of the component Stripe Integration. The manipulation of the argument sessionId leads to authentication replay. This vulnerability is documented as CVE-2026-57562. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Readest up to 0.11.9. It has been rated as critical. This issue affects an unknown code block of the file apps/readest-app/src/app/api/stripe/check/route.ts of the component Stripe Integration. The manipulation of the argument sessionId with an unknown input leads to a authentication replay vulnerability. Using CWE to declare the problem leads to CWE-294. A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes). Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Readest is a modern, feature-rich ebook reader designed for seamless cross-platform access and an intuitive reading experience. Prior to 0.11.10, POST /api/stripe/check in apps/readest-app/src/app/api/stripe/check/route.ts accepted a client-controlled sessionId, retrieved the corresponding Stripe Checkout Session, and granted the paid plan to the authenticated caller without verifying session.metadata.userId. The createOrUpdateSubscription path then updated the plans row keyed by the caller's user identifier rather than the Checkout Session owner. Any authenticated free user with a paid active Checkout Session identifier, including one from the user's own single legitimate purchase, could replay that identifier to upgrade additional accounts without payment. This issue is fixed in version 0.11.10.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-57562 since 06/24/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1040 for this issue.

Upgrading to version 0.11.10 eliminates this vulnerability.

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Productinfo

Name

• Readest

Version

• 0.11.0
• 0.11.1
• 0.11.2
• 0.11.3
• 0.11.4
• 0.11.5
• 0.11.6
• 0.11.7
• 0.11.8
• 0.11.9

Website

• Product: https://github.com/readest/readest/

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