CVE-2026-110628: Kan 0.5.5 through 0.6.0 Unauthenticated SSRF via /api/download/attatchment

Is it exploited?

Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of 13 Nov 2026.

VulnCheck KEV lists it since 13 Nov 2026. It cites 1 public report, the first from 13 Nov 2026.

• ess.coalitioninc.com

How likely is exploitation in the next 30 days?

0.4%

EPSS score, percentile 37.3 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?

9.2 Critical

CVSS v4.0 base score, given by the CNA

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (3)

Which versions are affected?

Affected

• 0.5.5 through 0.6.0

Versions by product

Source: CISA KEV 2026.11.13, as of 13 Nov 2026; VulnCheck KEV, as of 13 Nov 2026; FIRST EPSS, as of 13 Nov 2026; CVE List, as of 13 Nov 2026. About the data.

Description

Kan 0.5.5 through 0.6.0 Unauthenticated SSRF via /api/download/attatchment

Kan 0.5.5 through 0.6.0 contains an unauthenticated server-side request forgery vulnerability in the /api/download/attatchment route due to an incomplete fix for CVE-2026-32255. When S3_ENDPOINT is unset, attackers can pass arbitrary url query parameters to fetch() to read internal services, localhost ports, and cloud instance metadata.

Source: CVE List, as of 13 Nov 2026. About the data.

What to do

Advisories and patches

• Open PR describing the S3_ENDPOINT-unset bypass (Issue tracking, Patch)
• Incomplete fix for CVE-2026-32255 (Patch)
• GitHub Security Advisory (GHSA-qrx8-9hc6-jvqg) (Vendor advisory)

This summary is based on the CVE record as of 13 Nov 2026. Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

Source: CVE List, as of 13 Nov 2026. About the data.

Timeline