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Advisory record · GHSA-w89x-c962-c44g

Cloudreve: Privilege Scope Bypass: State-Mutating Admin Operations Accessible via Read-Only OAuth Scope

CVSS 3.8 LowEPSS 0.0033 · 25th percentile

Published by the GitHub Advisory Database at 22 Sept 2026, 20:40 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/cloudreve/Cloudreve/v4Go<4.0.0-20260715070110-bce08f88e9d84.0.0-20260715070110-bce08f88e9d8
Identifiers
GHSA-w89x-c962-c44g · CVE-2026-77637 · GO-2026-6576
Weakness (CWE)
CWE-862
Tags
Published
22 Sept 2026
Updated
1 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Cloudreve (Go package github.com/cloudreve/Cloudreve/v4) versions before 4.0.0-20260715070110-bce08f88e9d8 let an OAuth token that has only Admin.Read scope call two admin endpoints that should require write scope: the WOPI configuration fetch and the SMTP mail test. An attacker holding such a token could send email through the server's SMTP account and probe WOPI service connectivity. Upgrade to 4.0.0-20260715070110-bce08f88e9d8 or later, which adds the missing write-scope check.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
3.8 Low 3.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0033, the 25th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:12 UTC First seen by agentprime
  2. 31 Oct 2026, 14:12 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.