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CVE-2026-54560· NVD / CVE Program· CNA GitHub_M

Cloudreve: OAuth access tokens bypass scope enforcement due to missing client_id claim

Cloudreve is a self-hosted file management and sharing system. From 4.12.0 until 4.16.1, Cloudreve's OAuth access tokens are issued without the OAuth client_id claim, so the JWT verifier does not load token scopes into request context and RequiredScopes treats the request like non-scoped session authentication, allowing a low-scope OAuth access token to call APIs requiring higher scopes such as file, share, workflow, user setting, WebDAV account, and potentially admin scopes. This issue is fixed in version 4.16.1.

HighCVSS 7.6 · v3.1—No exploit Fix available

Noroxi analysis

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Published
Jul 15, 2026
Updated
Jul 15, 2026
EPSS
0.5% · 38th percentile
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Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.6 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
7.6
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • cloudreve cloudreve

    • >= 4.12.0, < 4.16.1affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Gogithub.com/cloudreve/Cloudreveall versions—
Gogithub.com/cloudreve/Cloudreve/v3all versions—
Gogithub.com/cloudreve/Cloudreve/v4from 4.0.0-20260114075425-bc6845bd742c · before 4.0.0-20260606015557-ed20843dc3df4.0.0-20260606015557-ed20843dc3df

Same product

cloudreve: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-25726Cloudreve is vulnerable to Account Takeover via Weak Cryptographic Token Generation (Insecure PRNG Seeding)
    39Monitor
  • CVE-2026-77633Cloudreve: Storage-quota TOCTOU race allows quota bypass and storage-based denial of service
    28Monitor
  • CVE-2026-55502Cloudreve: OAuth Admin.Read scope can update OneDrive storage policy credentials
    28Monitor
  • CVE-2026-54563Cloudreve: Path Traversal / Broken Access Control in Cloudreve WebDAV (`/dav`) — scoped DAV credential escapes its configured account root
    28Monitor
  • CVE-2026-101056Cloudreve before 4.16.1 Authentication Bypass via Cached Context Hint
    27Monitor
  • CVE-2026-79913Cloudreve: SSRF guard bypass: checkIP does not decode IPv6-transition wrappers (NAT64, IPv4-compatible, 6to4) reaching internal and cloud-metadata addresses
    26Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
cloudreve cloudreve4.16.1 · descriptionVendor (CNA)
Go:github.com/cloudreve/Cloudreve/v44.0.0-20260606015557-ed20843dc3dfPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-545630 days apartCloudreve: Path Traversal / Broken Access Control in Cloudreve WebDAV (`/dav`) — scoped DAV credential escapes its configured account root
    28Monitor
  • CVE-2026-5550216 days apartCloudreve: OAuth Admin.Read scope can update OneDrive storage policy credentials
    28Monitor
  • CVE-2026-10105674 days apartCloudreve before 4.16.1 Authentication Bypass via Cached Context Hint
    27Monitor
  • CVE-2026-6232316 days apartCloudreve: Unauthorized file write via WOPI view sessions whose access token secret is ignored
    25Monitor
  • CVE-2026-10104874 days apartCloudreve before 4.17.0 SSRF via Admin.Read OAuth scope
    21Monitor
  • CVE-2026-5549916 days apartCloudreve: Broken access control in file event stream leaks activity events for unshared siblings to single-file share recipients
    17Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
low · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
Low

Weakness class (CWE)

CWE-863 · Incorrect Authorization

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records