# CVE-2026-57562: Readest ebook reader privilege escalation in Stripe payment verification

Source: https://junglewise.ai/threats/cve-2026-57562-readest-is-a-modern-feature-rich-ebook-reader-designed-for  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-04. Updated: 2026-11-04  
License: CC BY 4.0 with a link back

CVE-2026-57562 · Severity: medium · CVSS 6.5 · Published 2026-11-04

Readest is an ebook reader app that uses Stripe for paid subscription management. An authenticated user could replay another user's Stripe checkout session to fraudulently grant themselves a paid subscription without payment. This allowed attackers to upgrade multiple accounts to premium status at no cost by reusing a single valid payment session identifier.

Technologies: [Readest](https://junglewise.ai/threats/technologies/readest). Vendors: [Readest](https://junglewise.ai/threats/vendors/readest).

## Quick answers

**Is CVE-2026-57562 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-57562 being exploited in the wild.

**How severe is CVE-2026-57562?** Medium severity, with a CVSS score of 6.5, published 4 November 2026.

**Which products and versions are affected?** Readest prior to 0.11.10.

**Is there a fix for CVE-2026-57562?** Yes: fixed in 0.11.10. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-57562 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-57562?** Check whether you run Readest at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 0.11.10

## Technical details

The POST /api/stripe/check endpoint accepted a client-controlled sessionId and retrieved the corresponding Stripe Checkout Session, then granted the paid plan to the authenticated caller without verifying that session.metadata.userId matched the caller's user ID. Any authenticated free user with access to a paid Checkout Session identifier—including one from a legitimate purchase—could replay it to upgrade additional accounts. The vulnerability is an authorization bypass allowing privilege escalation through missing ownership validation on the entitlement binding.

## Affected products

- Readest Readest prior to 0.11.10

## Timeline

- 2026-11-04: disclosed
- 2026-06-18: patched

## References

- [https://github.com/readest/readest/commit/495783d04516d05b2eb10f8f8bad297d436b36de](https://github.com/readest/readest/commit/495783d04516d05b2eb10f8f8bad297d436b36de)
- [https://github.com/readest/readest/pull/4638](https://github.com/readest/readest/pull/4638)

## Related threats

- [Readest path traversal in file transfer commands](https://junglewise.ai/threats/cve-2026-57567-readest-is-a-modern-feature-rich-ebook-reader-designed-for)
- [Readest OPDS proxy server-side request forgery](https://junglewise.ai/threats/cve-2026-57566-readest-is-a-modern-feature-rich-ebook-reader-designed-for)
- [Readest ebook reader path traversal in storage upload](https://junglewise.ai/threats/cve-2026-57565-readest-is-a-modern-feature-rich-ebook-reader-designed-for)
- [Readest arbitrary code execution via EPUB iframe srcdoc injection](https://junglewise.ai/threats/cve-2026-82642-readest-arbitrary-code-execution-via-epub-iframe-srcdoc-injection)