Authentication Bypass in Calibre-Web via Kobo Auth Token

Publication date: 2026-05-03

Last updated on: 2026-05-03

Assigner: VulDB

Description

A vulnerability was identified in janeczku Calibre-Web up to 0.6.26. The impacted element is the function generate_auth_token of the file cps/kobo_auth.py of the component Endpoint. Such manipulation of the argument user_id leads to improper authorization. The attack may be launched remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-05-03

Last Modified

2026-05-03

Generated

2026-07-06

AI Q&A

2026-05-04

EPSS Evaluated

2026-07-04

NVD

CVE-2026-7709

Affected Vendors & Products

Vendor	Product	Version / Range
janeczku	calibre-web	to 0.6.26 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-285	The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.
CWE-266	A product incorrectly assigns a privilege to a particular actor, creating an unintended sphere of control for that actor.

Attack-Flow Graph

Impact Analysis

The vulnerability allows an attacker to manipulate authorization remotely, potentially gaining unauthorized access to resources or actions within the affected system. This could lead to unauthorized information disclosure, modification, or other impacts depending on the privileges gained.

Executive Summary

This vulnerability exists in janeczku Calibre-Web up to version 0.6.26, specifically in the function generate_auth_token within the cps/kobo_auth.py file. It involves improper authorization caused by manipulation of the user_id argument. An attacker can exploit this remotely to bypass authorization controls.

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