# CVE-2026-47202: Kavita improper authentication via JWT token validation flaw

Source: https://junglewise.ai/threats/cve-2026-47202-kavita-improper-authentication-via-jwt-token-validation-flaw  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-26. Updated: 2026-05-26  
License: CC BY 4.0 with a link back

CVE-2026-47202 · Severity: info · CVSS 9.3 · Published 2026-05-26

Kavita is a digital library server used for hosting and reading books and comics. A critical security flaw allows an unauthorized person to take over any user account, including administrator accounts, simply by knowing their username. This could lead to a total loss of privacy for readers and full control over the server's content and settings.

Technologies: [Kareadita Kavita](https://junglewise.ai/threats/technologies/kavita). Vendors: [Kareadita](https://junglewise.ai/threats/vendors/kareadita).

## Quick answers

**Is CVE-2026-47202 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-47202 being exploited in the wild.

**How severe is CVE-2026-47202?** Informational severity, with a CVSS score of 9.3, published 26 May 2026.

**Which products and versions are affected?** Kareadita Kavita < 0.9.0.2.

**Is there a fix for CVE-2026-47202?** A patch was published on 2026-05-14: Version 0.9.0.2 released as a security hotfix. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-47202 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-47202?** Check whether you run Kareadita Kavita 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.

## Technical details

An improper authentication vulnerability exists in Kavita due to flawed token validation logic. The root cause involves insufficient verification of data authenticity and incorrect comparisons during the authentication process (CWE-287, CWE-345, CWE-697). A remote, unauthenticated attacker can exploit this by requesting a JSON Web Token (JWT) for any valid username, including administrative accounts. Successful exploitation results in complete account takeover and full access to the application's API and management features. The vulnerability is addressed in version 0.9.0.2.

## Affected products

- Kareadita Kavita < 0.9.0.2

## Timeline

- 2026-05-14: patched: Version 0.9.0.2 released as a security hotfix.
- 2026-05-19: advisory: GitHub Security Advisory GHSA-m2v3-fcjh-hm22 published.
- 2026-05-26: disclosed: CVE-2026-47202 published to the NVD.

## References

- [https://github.com/Kareadita/Kavita/releases/tag/v0.9.0.2](https://github.com/Kareadita/Kavita/releases/tag/v0.9.0.2)
- [https://github.com/Kareadita/Kavita/security/advisories/GHSA-m2v3-fcjh-hm22](https://github.com/Kareadita/Kavita/security/advisories/GHSA-m2v3-fcjh-hm22)

## Related threats

- [Kavita path traversal in cover upload API](https://junglewise.ai/threats/cve-2022-51024-kavita-0-5-2-before-0-5-4-1-contains-a-path-traversal)
- [Kavita IDOR in download and metadata endpoints](https://junglewise.ai/threats/cve-2026-44776-kavita-idor-in-download-and-metadata-endpoints)
- [Kavita missing authentication in ReaderController image endpoint](https://junglewise.ai/threats/cve-2026-44775-kavita-missing-authentication-in-readercontroller-image-endpoint)