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CVE-2026-61500— Rejetto HFS < 3.2.1 Session Forgery via Predictable Signing Key

Quick assessment

Affected
rejetto hfs
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.

Rejetto hfs是意大利Rejetto公司的一款HTTP文件服务器软件。 Rejetto hfs 3.0.0版本至3.2.0版本存在加密问题漏洞，该漏洞源于会话cookie签名密钥来自非加密的Math.random()生成器并在登录时向未经身份验证的客户端泄露生成器输出，可能导致远程攻击者收集少量响应、重构生成器状态、恢复签名密钥并伪造管理员会话cookie，从而实现完全管理访问和远程代码执行。

CVSS 9.8 · Critical EPSS 0.99% · P61

Affected Version Matrix 1

VendorProduct Version RangeStatus
rejetto hfs 3.0.0< 3.2.1 affected
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I. Basic Information for CVE-2026-61500

Vulnerability Information
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Vulnerability Title
Rejetto HFS < 3.2.1 Session Forgery via Predictable Signing Key
Source: CVE Program / CVE List V5
Vulnerability Description
Rejetto HFS 3.0.0 through 3.2.0 derives its session-cookie signing key from the non-cryptographic Math.random() generator and discloses outputs of the same generator to unauthenticated clients during login. A remote attacker can collect a small number of login responses, reconstruct the generator's state, recover the signing key, and forge a valid administrator session cookie, leading to full administrative access and remote code execution via the server_code configuration feature.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/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
Rejetto hfs 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Rejetto hfs是意大利Rejetto公司的一款HTTP文件服务器软件。 Rejetto hfs 3.0.0版本至3.2.0版本存在加密问题漏洞，该漏洞源于会话cookie签名密钥来自非加密的Math.random()生成器并在登录时向未经身份验证的客户端泄露生成器输出，可能导致远程攻击者收集少量响应、重构生成器状态、恢复签名密钥并伪造管理员会话cookie，从而实现完全管理访问和远程代码执行。
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
rejetto hfs 3.0.0 ~ 3.2.1 -

II. Public POCs for CVE-2026-61500

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10102 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-2026-61500

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Vendor Advisories for CVE-2026-61500 (1)

Vendor Pages for CVE-2026-61500 (1)

Same Patch Batch · rejetto · 2026-07-13 · 6 CVEs total

CVE-2026-61501 6.1 MEDIUM Rejetto HFS < 3.2.1 Stored XSS in Admin Log Viewer
CVE-2026-61504 5.4 MEDIUM Rejetto HFS < 3.2.1 Stored XSS via File Names in Basic Web Listing
CVE-2026-61503 5.3 MEDIUM Rejetto HFS < 3.2.1 Username Enumeration via Login Response Differences
CVE-2026-61505 5.3 MEDIUM Rejetto HFS < 3.2.1 Limited File Disclosure via Path Traversal in lang Parameter
CVE-2026-61502 4.3 MEDIUM Rejetto HFS < 3.2.1 Cross-Site Request Forgery via GET Requests

IV. Related Vulnerabilities

Same product: hfs
Same vendor: rejetto
Same weakness: CWE-338

V. Comments for CVE-2026-61500

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