CVE-2026-77637Network attack vectorHinoki check available

Admin tool execution via missing write checks

Published Sep 22, 2026 · Updated Sep 22, 2026

Incorrect authorization in Cloudreve before 4.18.0 allows remote authenticated users with Admin.Read to invoke admin tool operations. The wopi GET and mail POST routes in routers/router.go inherited Admin.Read but omitted the Admin.Write middleware used by adjacent state-changing routes. An administrator-issued read-only OAuth token or API key is required; it can probe configured WOPI endpoints and send arbitrary test email through the server SMTP configuration.

CVSS severityUnavailable
Unscored
EPSS probability0.33%
Next 30 days · Oct 20, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Incorrect authorization in Cloudreve before 4.18.0 allows remote authenticated users with Admin.Read to invoke admin tool operations. The wopi GET and mail POST routes in routers/router.go inherited Admin.Read but omitted the Admin.Write middleware used by adjacent state-changing routes. An administrator-issued read-only OAuth token or API key is required; it can probe configured WOPI endpoints and send arbitrary test email through the server SMTP configuration.

The record

CVE
CVE-2026-77637
Published
Sep 22, 2026
Updated
Sep 22, 2026
Vendor
Cloudreve
Product
Cloudreve
Classifications
T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.18.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Cloudreve · Cloudreveversion=< 4.18.0

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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