kanbn kan up to 0.5.4 Attachment Download Endpoint attatchment fetch server-side request forgery

CVSS Meta Temp Score
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CTI Interest Score
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7.8$0-$5k0.00

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 databases at CNNVD (CNNVD-202603-3587) and EUVD (EUVD-2026-12997). Once again VulDB remains the best source for vulnerability data.

Productinfo

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Version

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Website

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

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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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

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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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
03/23/2026 +4 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: 🔒
CNNVD: CNNVD-202603-3587 - kan 代码问题漏洞

Entryinfo

Created: 03/19/2026 01:41
Updated: 03/23/2026 22:36
Changes: 03/19/2026 01:41 (70), 03/19/2026 01:49 (1), 03/20/2026 18:32 (6), 03/22/2026 02:40 (1), 03/22/2026 17:21 (1), 03/23/2026 22:36 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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