CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Called exploited 182 days after disclosure.
Measured from the CVE publication date to the earliest of 1 KEV catalogue that list it.
The life of this vulnerability
- CVE published
- First KEV listing6mo
- Last sighting1d
Gaps are compressed to equal steps. The elapsed time is printed under each.
Which catalogues call it exploited
- CISA KEVUS federaldoes not list it
- EUVDENISA, European Uniondoes not list it
- VulnCheck KEVcommercial researchlisted Sep 17, 2026
- CIRCLaggregator, mirrors the abovelisted Sep 17, 2026, not counted
This rests on a single catalogue. No second catalogue corroborates the claim that it is being exploited. CIRCL is an aggregator and is not counted.
Public exploitation evidence
- exploitedvulnerability.circl.lu/known-exploited-vulnerabilities-catal
- seenbsky.app/profile/cyberhub.blog/post/3mhgk6bessm22
- seenbsky.app/profile/cyberhub.blog/post/3mhgi2cd7nh2r
- seenbsky.app/profile/cve.skyfleet.blue/post/3mhfhs7ruqb2u
- seenbsky.app/profile/thehackerwire.bsky.social/post/3mheqsfjxvo2
5 public reports collected from VulnCheck and CIRCL, first on Mar 19, 2026. Each links to its original source. We have not verified them.
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.).
