CVE-2026-32255
CriticalExploitedKan is Vulnerable to Unauthenticated SSRF via Attachment Download Endpoint
Published Mar 18, 2026 · Updated Oct 16, 2026 · Also known as GHSA-qrx8-9hc6-jvqg
Key Facts
Patch immediately- CVE-2026-32255 is a critical-severity vulnerability (CVSS 9.2 v4) affecting Kan.
- It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Sep 17, 2026. No public exploit code is known.
- EPSS estimates a 1.7% probability of exploitation in the next 30 days.
- Fixed versions are available, including Kan 0.5.5.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v4
9.2
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
EPSS (30-day exploit likelihood)
1.7%
Higher than 77.4% of all scored CVEs
Exploited in the wild
Yes
2 catalog listings
Public exploit code
None known
Get the full CVE-2026-32255 brief as a PDF
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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.).
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Sep 17, 2026 | n/a | Not reported |
| CIRCL KEV | Sep 17, 2026 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| KanKan | >= < 0.5.5 | 0.5.5 |
Patched Releases
Kan
0.5.5
Timeline
Publicly disclosed
Mar 18, 2026
Added to Industry KEV feed
Sep 17, 2026
Added to CIRCL KEV
Sep 17, 2026
Last updated
Oct 16, 2026
Weakness Type
- CWE-918 Server-Side Request Forgery (SSRF)
References
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110628.json
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32255.json
- advisoryhttps://hackmd.io/@leediay/HyIxU63ofg
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-110628
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-32255
FAQ
Common Questions.
Kan is an open-source project management tool.
Affected: Kan versions >= < 0.5.5. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Sep 17, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Kan 0.5.5.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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