CVE-2026-110628 json
Kan 0.5.5 through 0.6.0 Unauthenticated SSRF via /api/download/attatchment
published 2026-10-14 26 d ago modified 2026-10-16 23 d ago also EUVD-2026-101256
- cvss
- 8.6
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 37%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- github.com/kanbn/kan@53397d8 commit
- github.com/kanbn/kan#590 pull request
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 24 d ago
Exploit prediction
0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 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 |
| CNA | 3.1 | 8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N |
| CNA | 4.0 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected products
- kanbn kan
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
-
github.com
/kanbn/kan/pull/590
issue-tracking, patch
-
github.com
/kanbn/kan/commit/53397d8e81dc1494d94132848c1f0416f1152bd7
patch
-
github.com
/kanbn/kan/security/advisories/GHSA-qrx8-9hc6-jvqg
vendor-advisory
-
hackmd.io
/@leediay/HyIxU63ofg
third-party-advisory
-
github.com
/kanbn/kan/blob/v0.6.0/apps/web/src/pages/api/download/attatchment.ts#L21-L52
technical-description
-
github.com
/kanbn/kan/blob/v0.6.0/.env.example#L25-L27
technical-description
-
github.com
/kanbn/kan
product
-
vulncheck.com
/advisories/kan-0.5.5-through-0.6.0-unauthenticated-ssrf-via-api-download-attatchment
third-party-advisory
Sources
- CVE List CVE-2026-110628
- NVD CVE-2026-110628
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.