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ExploitedNot in CISA KEV yetFix available

CVE-2026-32255

Exploitation confirmed. First attested on 2026-09-17 by GCVE · previdian, GCVE · shadowserver.

  • Published2026-03-19
  • Fixed in0.5.5
  • WeaknessCWE-918

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.).

Timeline

dates in UTC
  1. 2026-03-1900:16CVE publishedNVD
  2. 2026-09-17Listed as exploited by GCVEGCVE
  3. 2026-09-17Exploitation first reportedGCVE
  4. 2026-10-2523:12EPSS crossed 10 %FIRST EPSS

Versions per branch

NVD
Kan
BranchAffectedFixed in
0.5< 0.5.50.5.5

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • kanbn kan
    Affected
    • = < 0.5.5no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-03-18

Fix

  1. Update Kan to 0.5.5

Advisories and patches

Detection

read 2026-11-01 01:02 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-10-23
  • GCVEexploitation2026-09-17
  • CISA-ADPSSVC decisionnone2026-03-19
  • CNACVSS 3.18.6known since 2026-10-23
  • CNAweakness (CWE)CWE-918known since 2026-10-23
  • FIRST EPSSEPSS score26.9 %read 2026-11-09
  • PoC-in-GitHubproof of concept1known since 2026-11-01
  • ProjectDiscoverydetectionread 2026-11-09

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Published
2026-03-19
Last Modified
2026-06-17
NVD status
Analyzed

Frequently asked questions

What is CVE-2026-32255?

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.).

Is CVE-2026-32255 actively exploited?

Active exploitation of CVE-2026-32255 has not been confirmed. Its EPSS score was 26.9% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-32255?

CVE-2026-32255 has a CVSS v3 base score of 8.6 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.

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