CVE-2026-7709: janeczku Calibre-Web Endpoint kobo_auth.py generate_auth_token improper authorization

Severity: medium (CVSS 6.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-03 · updated 2026-10-26
Weakness: CWE-266

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.

Affected products

janeczku/calibre-web: 0.6.0, 0.6.1, 0.6.2, 0.6.3, 0.6.4, 0.6.5 (+21)

References

https://drive.google.com/drive/folders/1rosrcfxcHrQM7_GOiBwzY_GnCfXoFuVR?usp=drive_link
https://vuldb.com/submit/805823
https://vuldb.com/vuln/360885
https://vuldb.com/vuln/360885/cti

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