Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Calibre-Ebook | Calibre | < 9.4.0 |
Related Weaknesses (CWE)
References
- https://github.com/kovidgoyal/calibre/security/advisories/GHSA-5fpj-fxw7-8grwExploitMitigationVendor Advisory
FAQ
What is CVE-2026-27810?
CVE-2026-27810 is a vulnerability with a CVSS score of 6.4 (MEDIUM). 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 Serv...
How severe is CVE-2026-27810?
CVE-2026-27810 has been rated MEDIUM with a CVSS base score of 6.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-27810?
Check the references section above for vendor advisories and patch information. Affected products include: Calibre-Ebook Calibre.