CVE-2026-63765

HIGHPre-NVD 8.28.2—
EchelonGraph scoreHIGH confidence

Score 8.2 from GitHub Security Advisory (severity: HIGH) published 2026-07-23. a secondary CVSS source baseline 8.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.2Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
8.2
EG Score
8.2(high)
EG Risk
68(Attend)
EG Risk 68/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity82% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
31%
KEV
Not listed

Published

July 23, 2026

Last Modified

July 27, 2026

Advisory Details (5)

Auto-updated Jul 23, 2026
Patch available. Sources: github_commit, github_release, github_pr.
generic

Chatwoot < 4.16.0 Unauthenticated ActiveStorage Direct Upload Arbitrary Blob Creation | Advisories | VulnCheck

https://www.vulncheck.com/advisories/chatwoot-unauthenticated-activestorage-direct-upload-arbitrary-blob-creation
github_commit Patch Available

commit 8dd0d08322ed (chatwoot/chatwoot)

Patch available: chatwoot/chatwoot v4.16.0 (contains commit 8dd0d08322ed)

https://github.com/chatwoot/chatwoot/commit/8dd0d08322edafaec24624b72ed2f6045921cb7b
github_pr Patch Available

refactor: align conversation direct uploads with standard account auth

Patch available: chatwoot/chatwoot v4.16.0 (PR #15039 merged 2026-07-16)

https://github.com/chatwoot/chatwoot/pull/15039
github_release Patch Available

v4.16.0

Patch available: chatwoot/chatwoot v4.16.0

https://github.com/chatwoot/chatwoot/releases/tag/v4.16.0
generic

Issue · GitHub

https://github.com/chatwoot/chatwoot/issues/15072

Vendor Advisories for CVE-2026-63765(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 26× in last 7d / 26× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-30 01:30 UTCEPSS rescore
  2. 2026-07-30 01:30 UTCEPSS rescore
  3. 2026-07-29 19:43 UTCGHSA enrichment
  4. 2026-07-29 07:01 UTCGHSA enrichment
  5. 2026-07-28 18:27 UTCEG score recompute
  6. 2026-07-28 18:27 UTCGHSA enrichment
  7. 2026-07-28 15:37 UTCEPSS rescore
  8. 2026-07-28 05:53 UTCGHSA enrichment
  9. 2026-07-27 17:20 UTCEG score recompute
  10. 2026-07-27 17:20 UTCGHSA enrichment
  11. 2026-07-27 16:47 UTCEG score recompute
  12. 2026-07-27 16:47 UTCGHSA enrichment
  13. 2026-07-27 14:14 UTCEPSS rescore
  14. 2026-07-27 04:15 UTCGHSA enrichment
  15. 2026-07-26 15:40 UTCEG score recompute
  16. 2026-07-26 15:40 UTCGHSA enrichment
  17. 2026-07-26 14:54 UTCEPSS rescore
  18. 2026-07-26 14:54 UTCEPSS rescore
  19. 2026-07-26 03:07 UTCEG score recompute
  20. 2026-07-26 03:07 UTCGHSA enrichment
  21. 2026-07-25 14:18 UTCEPSS rescore
  22. 2026-07-25 14:18 UTCEPSS rescore
  23. 2026-07-24 14:18 UTCEPSS rescore
  24. 2026-07-24 14:18 UTCEPSS rescore
  25. 2026-07-23 18:22 UTCEG score recompute
Show 1 more
  1. 2026-07-23 18:21 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-63765?
CVE-2026-63765 is a high vulnerability published on July 23, 2026. 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,…
When was CVE-2026-63765 disclosed?
CVE-2026-63765 was first published in the National Vulnerability Database on July 23, 2026, with the most recent update on July 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-63765 actively exploited?
CVE-2026-63765 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 69.3% of all scored CVEs.
What is the CVSS score of CVE-2026-63765?
CVE-2026-63765 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-63765?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63765, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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