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CVE-2026-25726— Cloudreve is vulnerable to Account Takeover via Weak Cryptographic Token Generation (Insecure PRNG Seeding)

Quick assessment

Affected
cloudreve cloudreve
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cloudreve是Cloudreve开源的一个支持多家云存储驱动的公有云文件系统。 Cloudreve 4.13.0之前版本存在安全特征问题漏洞，该漏洞源于使用弱伪随机数生成器生成安全密钥，可能导致伪造JWT令牌和账户接管。

CVSS 8.1 · High EPSS 0.50% · P41
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I. Basic Information for CVE-2026-25726

Vulnerability Information
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Vulnerability Title
Cloudreve is vulnerable to Account Takeover via Weak Cryptographic Token Generation (Insecure PRNG Seeding)
Source: CVE Program / CVE List V5
Vulnerability Description
Cloudreve is a self-hosted file management and sharing system. Prior to version 4.13.0, the application uses the weak pseudo-random number generator math/rand seeded with time.Now().UnixNano() to generate critical security secrets, including the secret_key, and hash_id_salt. These secrets are generated upon first startup and persisted in the database. An attacker can exploit this by obtaining the administrator's account creation time (via public API endpoints) to narrow the search window for the PRNG seed, and use known hashid to validate the seed. By brute-forcing the seed (demonstrated to take <3 hours on general consumer PC), an attacker can predict the secret_key. This allows them to forge valid JSON Web Tokens (JWTs) for any user, including administrators, leading to full account takeover and privilege escalation. This issue has been patched in version 4.13.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用具有密码学弱点缺陷的PRNG
Source: CVE Program / CVE List V5
Vulnerability Title
Cloudreve 安全特征问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cloudreve是Cloudreve开源的一个支持多家云存储驱动的公有云文件系统。 Cloudreve 4.13.0之前版本存在安全特征问题漏洞，该漏洞源于使用弱伪随机数生成器生成安全密钥，可能导致伪造JWT令牌和账户接管。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
cloudreve cloudreve < 4.13.0 -

II. Public POCs for CVE-2026-25726

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8296 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-25726

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Vendor Advisories for CVE-2026-25726 (1)

Vendor Pages for CVE-2026-25726 (1)

IV. Related Vulnerabilities

Same product: cloudreve
Same vendor: cloudreve
Same weakness: CWE-338

V. Comments for CVE-2026-25726

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