CVE-2026-32255 | kanbn kan up to 0.5.4 Attachment Download Endpoint attatchment fetch server-side request forgery (GHSA-qrx8-9hc6-jvqg / EUVD-2026-12997)

VDB-351644 · CVE-2026-32255 · GHSA-QRX8-9HC6-JVQG KANBN KAN UP TO 0.5.4 ATTACHMENT DOWNLOAD ENDPOINT ATTATCHMENT FETCH SERVER-SIDE REQUEST FORGERY HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.8 $0-$5k 3.59+ Summaryinfo A vulnerability was found in kanbn kan up to 0.5.4. It has been declared as critical. The impacted element is the function fetch of the file /api/download/attatchment of the component Attachment Download Endpoint. Such manipulation leads to server-side request forgery. This vulnerability is traded as CVE-2026-32255. The attack may be launched remotely. There is no exploit available. It is recommended to upgrade the affected component. Detailsinfo A vulnerability was found in kanbn kan up to 0.5.4 and classified as critical. Affected by this issue is the function fetch of the file /api/download/attatchment of the component Attachment Download Endpoint. The manipulation with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. CVE summarizes: Kan is an open-source project management tool. In versions 0.5.4 and below, the /api/download/attatchment endpoint has no authentication and no URL validation. The Attachment Download endpoint accepts a user-supplied URL query parameter and passes it directly to fetch() server-side, and returns the full response body. An unauthenticated attacker can use this to make HTTP requests from the server to internal services, cloud metadata endpoints, or private network resources. This issue has been fixed in version 0.5.5. To workaround this issue, block or restrict access to /api/download/attatchment at the reverse proxy level (nginx, Cloudflare, etc.). The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-32255 since 03/11/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. Upgrading to version 0.5.5 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 53397d8e81dc1494d94132848c1f0416f1152bd7 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version. The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-12997). Productinfo Vendor kanbn Name kan Version 0.5.0 0.5.1 0.5.2 0.5.3 0.5.4 License open-source Website Product: https://github.com/kanbn/kan/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 7.9 VulDB Meta Temp Score: 7.8 VulDB Base Score: 7.3 VulDB Temp Score: 7.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 8.6 CNA Vector (GitHub_M): 🔒 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: No Local: No 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: kan 0.5.5 Patch: 53397d8e81dc1494d94132848c1f0416f1152bd7 Timelineinfo 03/11/2026 CVE reserved 03/19/2026 +8 days Advisory disclosed 03/19/2026 +0 days VulDB entry created 03/19/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: GHSA-qrx8-9hc6-jvqg Status: Confirmed CVE: CVE-2026-32255 (🔒) GCVE (CVE): GCVE-0-2026-32255 GCVE (VulDB): GCVE-100-351644 EUVD: 🔒 Entryinfo Created: 03/19/2026 01:41 Updated: 03/19/2026 01:49 Changes: 03/19/2026 01:41 (70), 03/19/2026 01:49 (1) Complete: 🔍 Cache ID: 99:A72:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸