Read the docs
TI-2026-73440 Aliases CVE-2026-110223GHSA-r6xw-vr9q-6g8x

SSRF blocklist bypass in Kavita via upload-cbl-file endpoint

Priority LOW 12CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-918 and the CVSS impact.

Summary

Kavita from 0.9.0 through 0.9.1.4 contains a server-side request forgery flaw (CWE-918) in which an authenticated user can bypass the SSRF blocklist. A host that rebinds through DNS or redirects over HTTPS to internal addresses after validation lets the attacker probe internal ports and services blindly through the upload-cbl-file endpoint. The CVSS 4.0 vector requires low privileges and no user interaction.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00279 20th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
KareaditaKavita0.9.0 – 0.9.1.4—No fix listedCNA
  • Kavita VendorKareadita Affected 0.9.0 – 0.9.1.4 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for Kavita.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

  1. 2026-10-13 Threatist record created from CVE-2026-110223
  2. 2026-10-13 Alias added: GHSA-r6xw-vr9q-6g8x
  3. 2026-10-15 CISA SSVC decision points changed

References

Advisory 1

Other 3

  • TI-2022-03662 Improper Restriction of Excessive Authentication Attempts in kareadita/kavita CVSS 3.1CRITICAL 9.8
  • TI-2022-26712 Path traversal in Kavita lets unauthenticated attackers read files CVSS 4.0HIGH 8.7
  • TI-2026-32661 Kavita: IDOR in /api/Download/* CVSS 4.0MEDIUM 5.9
  • TI-2022-03617 Improper Restriction of Excessive Authentication Attempts in kareadita/kavita CVSS 3.1MEDIUM 5.3
  • TI-2026-34790 Kavita: Pre-Auth Account Takeover CVSS 4.0CRITICAL 9.3
  • TI-2026-32660 Kavita: No authentication at /api/Reader/image CVSS 4.0MEDIUM 6.9
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences