# CVE-2026-57562: Readest: Subscription/entitlement hijack: /api/stripe/check binds any paid Checkout Session to the caller

Status: published. Published: 2026-11-04. Updated: 2026-11-04.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- readest / readest: < 0.11.10 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-639

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/readest/readest/security/advisories/GHSA-pv88-3727-j7v8 (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/readest/readest/pull/4638 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/readest/readest/commit/495783d04516d05b2eb10f8f8bad297d436b36de (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/readest/readest/releases/tag/v0.11.10 (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-57562; retrieved 2026-11-04; source updated 2026-11-04

Revision: 4ef36ecdc4c8183f56c87991f00b6ca8969d7b93c8a378f403fe3d7500663046

Canonical: https://y2.dev/cve/CVE-2026-57562

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