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TI-2026-45352 Aliases CVE-2026-63765GHSA-9wjj-m9cm-hjjc

Chatwoot < 4.16.0 Unauthenticated ActiveStorage Direct Upload Arbitrary Blob Creation

Priority HIGH 77CWE-306Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-306.

Summary

Chatwoot before 4.16.0 contains an authentication bypass vulnerability in the direct uploads controller that allows unauthenticated attackers to create arbitrary ActiveStorage blobs in any tenant account. Attackers can exploit missing authentication checks to resolve any account and conversation, then obtain signed PUT URLs to write arbitrary data to the application's storage backend.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00481 41st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed chatwoot (chatwoot): 4.16.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
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
chatwootchatwootbefore 4.16.04.16.0Patch availableCNA
  • chatwoot Vendorchatwoot Affected before 4.16.0 Fixed in 4.16.0 Patch available CNA

Remediation

  • Fix · CNA chatwoot (chatwoot) Fixed in 4.16.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-63765
  2. 2026-10-03 Alias added: GHSA-9wjj-m9cm-hjjc
  3. 2026-11-07 EPSS moved to the below the 50th percentile

References

Exploit 1

Patch 3

  • TI-2022-03436 Improper Restriction of Excessive Authentication Attempts in chatwoot/chatwoot CVSS 3.1CRITICAL 9.8
  • TI-2023-01984 Cross-site Scripting (XSS) - DOM in chatwoot/chatwoot CVSS 3.1MEDIUM 6.1
  • TI-2025-11229 chatwoot Admin IframeLoader.vue cross site scripting CVSS 4.0MEDIUM 5.3
  • TI-2024-00591 Stored XSS in chatwoot/chatwoot CVSS 3.1MEDIUM 4.8
  • TI-2025-15587 Chatwoot has a Blind SQL-injection in Conversation and Contacts filters CVSS 3.1CRITICAL 9.1
  • TI-2021-02675 Server-Side Request Forgery (SSRF) in chatwoot/chatwoot CVSS 3.1HIGH 8.8
See all 22 →

Sources

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