CVE-2026-27810

MEDIUM

6.4

Description

calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to version 9.4.0, an HTTP Response Header Injection vulnerability in the calibre Content Server allows any authenticated user to inject arbitrary HTTP headers into server responses via an unsanitized `content_disposition` query parameter in the `/get/` and `/data-files/get/` endpoints. All users running the calibre Content Server with authentication enabled are affected. The vulnerability is exploitable by any authenticated user and can also be triggered by tricking an authenticated victim into clicking a crafted link. Version 9.4.0 contains a fix for the issue.

CVE Details

CVSS v3.1 Score6.4

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published2/27/2026

Last Modified3/4/2026

Sourcenvd

Honeypot Sightings0

Affected Products

calibre-ebook:calibre

Weaknesses (CWE)

CWE-113

References

https://github.com/kovidgoyal/calibre/security/advisories/GHSA-5fpj-fxw7-8grw(security-advisories@github.com)

IOC Correlations

No correlations recorded

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