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CVE-2026-101056— Cloudreve before 4.16.1 Authentication Bypass via Cached Context Hint

Quick assessment

Affected
cloudreve cloudreve
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cloudreve 4.16.1 版本之前的版本在从 context_hint UUID 恢复缓存的导航器状态时，未能重新验证分享访问权限。攻击者如果此前拥有有效的分享访问权限，可以在分享被删除、过期或剩余下载次数降至零后的最多 300 秒内，通过重放该缓存的提示（hint），重新生成已分享文件的签名下载链接。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1552 · Unsecured Credentials
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I. Basic Information for CVE-2026-101056

Vulnerability Information
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Vulnerability Title
Cloudreve before 4.16.1 Authentication Bypass via Cached Context Hint
Source: CVE Program / CVE List V5
Vulnerability Description
Cloudreve before 4.16.1 fails to revalidate share access when restoring cached navigator state from a context_hint UUID. Attackers who previously had valid share access can replay the cached hint to generate signed file URLs for up to 300 seconds after the share is deleted, expires, or reaches zero remaining downloads.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
cloudreve cloudreve 0 ~ 4.16.1 -

II. Public POCs for CVE-2026-101056

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III. Intelligence Information for CVE-2026-101056

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Other References for CVE-2026-101056 (1)

Other References for CVE-2026-101056 (1)

Same Patch Batch · cloudreve · 2026-09-27 · 3 CVEs total

CVE-2026-101048 5.4 MEDIUM Cloudreve before 4.17.0 SSRF via Admin.Read OAuth scope
CVE-2026-101051 3.1 LOW Cloudreve before 4.16.1 Path Traversal via Remote Download

IV. Related Vulnerabilities

Same product: cloudreve
Same vendor: cloudreve
Same weakness: CWE-863

V. Comments for CVE-2026-101056

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