CVE-2026-32255
Kan is Vulnerable to Unauthenticated SSRF via Attachment Download Endpoint
Description
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.).
INFO
Published Date :
March 19, 2026, 12:16 a.m.
Last Modified :
March 19, 2026, 3:45 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE |
Solution
- Update Kan to version 0.5.5 or higher.
- Restrict access to the /api/download/attatchment endpoint.
Public PoC/Exploit Available at Github
CVE-2026-32255 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-32255.
| URL | Resource |
|---|---|
| https://github.com/kanbn/kan/commit/53397d8e81dc1494d94132848c1f0416f1152bd7 | Patch |
| https://github.com/kanbn/kan/releases/tag/v0.5.5 | Product Release Notes |
| https://github.com/kanbn/kan/security/advisories/GHSA-qrx8-9hc6-jvqg | Mitigation Patch Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-32255 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-32255
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
This repository contains a proof of concept (POC) for CVE-2026-32255, a high-severity Server-Side Request Forgery (SSRF) vulnerability in Kan, an open-source project management tool.
cve hacking poc research ssrf vulnerability
Shell Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-32255 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-32255 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Mar. 19, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:kan:kan:*:*:*:*:*:*:*:* versions up to (excluding) 0.5.5 Added Reference Type GitHub, Inc.: https://github.com/kanbn/kan/commit/53397d8e81dc1494d94132848c1f0416f1152bd7 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/kanbn/kan/releases/tag/v0.5.5 Types: Product, Release Notes Added Reference Type GitHub, Inc.: https://github.com/kanbn/kan/security/advisories/GHSA-qrx8-9hc6-jvqg Types: Mitigation, Patch, Vendor Advisory -
New CVE Received by [email protected]
Mar. 19, 2026
Action Type Old Value New Value Added Description 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.). Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N Added CWE CWE-918 Added Reference https://github.com/kanbn/kan/commit/53397d8e81dc1494d94132848c1f0416f1152bd7 Added Reference https://github.com/kanbn/kan/releases/tag/v0.5.5 Added Reference https://github.com/kanbn/kan/security/advisories/GHSA-qrx8-9hc6-jvqg