---
id: CVE-2026-62323
title: Cloudreve is a self-hosted file management and sharing system
summary: >-
  Cloudreve is a self-hosted file management and sharing system. Prior to
  4.17.0, ViewerSessionValidation uses only the session-id prefix of a WOPI
  access token and does not enforce the requested viewer action, allowing a
  malicious or comp…
severity: medium
cvss: 6.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N'
cwe:
  - CWE-863
vendor: cloudreve
product: github.com/cloudreve/Cloudreve/v4
affected:
  - github.com/cloudreve/Cloudreve/v4 < 4.0.0-20260626022433-f3347130ac48
  - github.com/cloudreve/Cloudreve/v3 <= 3.0.0-20250225100611-da4e44b77af4
patched:
  - github.com/cloudreve/Cloudreve/v4 4.0.0-20260626022433-f3347130ac48
published: '2026-07-31'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:51:43.490'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-62323'
references:
  - url: >-
      https://github.com/cloudreve/cloudreve/commit/f3347130ac48f2ff996af9ef66c97be2dda9cba9
    label: security-advisories@github.com
  - url: 'https://github.com/cloudreve/cloudreve/releases/tag/4.17.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/cloudreve/cloudreve/security/advisories/GHSA-c3jm-gv5r-9wcp
    label: security-advisories@github.com
  - url: >-
      https://github.com/cloudreve/cloudreve/security/advisories/GHSA-c3jm-gv5r-9wcp
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-c3jm-gv5r-9wcp'
tags:
  - nvd
  - ghsa
  - go
epss: 0.00171
epssPercentile: 0.06798
aliases:
  - GHSA-c3jm-gv5r-9wcp
ecosystem: go
ingestedAt: '2026-07-24T21:39:14.193Z'
---

## Overview

Cloudreve is a self-hosted file management and sharing system. Prior to 4.17.0, ViewerSessionValidation uses only the session-id prefix of a WOPI access token and does not enforce the requested viewer action, allowing a malicious or compromised WOPI viewer with a view session to forge the token suffix and invoke WOPI write routes for the underlying file. This issue is fixed in version 4.17.0.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-62323)

Affected packages:

- `github.com/cloudreve/Cloudreve/v4 < 4.0.0-20260626022433-f3347130ac48`
- `github.com/cloudreve/Cloudreve/v3 <= 3.0.0-20250225100611-da4e44b77af4`

Patched in:

- `github.com/cloudreve/Cloudreve/v4 4.0.0-20260626022433-f3347130ac48`

Source: https://github.com/advisories/GHSA-c3jm-gv5r-9wcp