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CVE-2026-77633

7.1 · HIGH

Cloudreve is a self-hosted file management and sharing system.

Published Sep 22, 2026CWE-362EPSS 0.37%

Overview

CVE-2026-77633 is a high-severity vulnerability. It was published on September 22, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Cloudreve is a self-hosted file management and sharing system. Prior to 4.18.0, PrepareUpload in pkg/filemanager/fs/dbfs/upload.go checks a stale in-memory user storage value through validateUserCapacity and later applies an unconditional storage charge outside the same quota-enforcing transaction. An authenticated user with Files.Write permission can issue concurrent upload-session requests that read the same capacity snapshot, all pass the MaxStorage check, and reserve their declared sizes through CommitWithStorageDiff. The resulting reservations can exceed the account quota and can be materialized as chunked uploads that exhaust host storage and deny uploads to other users. The default local-storage policy and default User group are affected. This issue is fixed in version 4.18.0.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/cloudreve/cloudreve/commit/7329602751c00bb4136fe9ad8b364d0df70773dfGitHubgithub.com/cloudreve/cloudreve/releases/tag/4.18.0GitHubgithub.com/cloudreve/cloudreve/security/advisories/GHSA-xj3h-wwxq-gfcj

How CyberStrike helps

Frequently asked questions

What is CVE-2026-77633?

CVE-2026-77633 is a high-severity vulnerability. It was published on September 22, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-77633?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-77633?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-77633?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-77633 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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