CVE-2026-110223
Kavita 0.9.0 through 0.9.1.4 SSRF Blocklist Bypass via upload-cbl-file Endpoint
- State
- Published
- Severity
- 2.3 Low
- Published
- Oct 13, 2026
- Updated
- Oct 14, 2026
- Reserved
- Oct 13, 2026
Description
Kavita 0.9.0 through 0.9.1.4 contains a server-side request forgery vulnerability that allows authenticated users to bypass the SSRF blocklist through DNS rebinding or HTTPS redirects. Attackers can submit a URL to POST /api/Cbl/upload-cbl-file whose host rebinds or redirects to internal addresses after validation, enabling blind internal port and service probing.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 2.3 Low | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 3.1 Low | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N | VulnCheck |
Weaknesses
- CWE-918 Server-Side Request Forgery (SSRF)
Affected Products
| Product | Versions |
|---|---|
KavitaKareadita |
|
References
- https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/kavita-cbl-url-preflight-ssrfthird-party-advisory
- https://github.com/Kareadita/Kavita/blob/879b8b73eb41d66f88dde8eb874cc99a3397eb11/Kavita.Server/Controllers/CBLController.cs#L82-L108technical-description
- https://github.com/Kareadita/Kavita/blob/879b8b73eb41d66f88dde8eb874cc99a3397eb11/Kavita.Common/Helpers/FlurlConfiguration.cs#L46-L89technical-description
- https://github.com/Kareadita/Kavitaproduct
- VulnCheck Advisory: Kavita 0.9.0 through 0.9.1.4 SSRF Blocklist Bypass via upload-cbl-file Endpointthird-party-advisory
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