CVE-2026-33205 | kovidgoyal calibre up to 9.5.x background-image Endpoint server-side request forgery

VDB-353916 · CVE-2026-33205 · GCVE-0-2026-33205 KOVIDGOYAL CALIBRE UP TO 9.5.X BACKGROUND-IMAGE ENDPOINT SERVER-SIDE REQUEST FORGERY HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.0 $0-$5k 1.09+ Summaryinfo A vulnerability labeled as critical has been found in kovidgoyal calibre up to 9.5.x. This affects an unknown part of the component background-image Endpoint. The manipulation results in server-side request forgery. This vulnerability is identified as CVE-2026-33205. The attack can be executed remotely. There is not any exploit available. The affected component should be upgraded. Detailsinfo A vulnerability classified as critical has been found in kovidgoyal calibre up to 9.5.x. Affected is an unknown part of the component background-image Endpoint. The manipulation with an unknown input leads to a server-side request forgery vulnerability. CWE is classifying the issue as CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes: calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to version 9.6.0, a Server-Side Request Forgery vulnerability in the background-image endpoint of calibre e-book reader's web view allows an attacker to perform blind GET requests to arbitrary URLs and exfiltrate information out from the ebook sandbox. Version 9.6.0 patches the issue. The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-33205 since 03/18/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. Upgrading to version 9.6.0 eliminates this vulnerability. Productinfo Vendor kovidgoyal Name calibre Version 9.0 9.1 9.2 9.3 9.4 9.5 Website Product: https://github.com/kovidgoyal/calibre/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 6.3 VulDB Meta Temp Score: 6.0 VulDB Base Score: 6.3 VulDB Temp Score: 6.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Server-side request forgery CWE: CWE-918 CAPEC: 🔒 ATT&CK: 🔒 Physical: Partially Local: Yes Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: calibre 9.6.0 Timelineinfo 03/18/2026 CVE reserved 03/27/2026 +9 days Advisory disclosed 03/27/2026 +0 days VulDB entry created 03/27/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Status: Confirmed CVE: CVE-2026-33205 (🔒) GCVE (CVE): GCVE-0-2026-33205 GCVE (VulDB): GCVE-100-353916 Entryinfo Created: 03/27/2026 15:44 Changes: 03/27/2026 15:44 (67) Complete: 🔍 Cache ID: 99:207:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸