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CVE-2026-61503— Rejetto HFS < 3.2.1 Username Enumeration via Login Response Differences

Quick assessment

Affected
rejetto hfs
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.

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版本存在日志信息泄露漏洞，该漏洞源于登录端点响应差异，可能导致远程未经身份验证的攻击者确认有效账户名称，便于密码猜测和会话伪造攻击。

CVSS 5.3 · Medium EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

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-2026-61503

Vulnerability Information
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Vulnerability Title
Rejetto HFS < 3.2.1 Username Enumeration via Login Response Differences
Source: CVE Program / CVE List V5
Vulnerability Description
Rejetto HFS 3.0.0 through 3.2.0 returns observably different responses from its login endpoint depending on whether the submitted username exists. A remote unauthenticated attacker can use this to confirm valid account names, including the default admin account, facilitating password-guessing and session-forgery attacks.
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
响应差异性信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Rejetto HFS 侧信道信息泄露漏洞
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版本存在日志信息泄露漏洞，该漏洞源于登录端点响应差异，可能导致远程未经身份验证的攻击者确认有效账户名称，便于密码猜测和会话伪造攻击。
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-2026-61503

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III. Intelligence Information for CVE-2026-61503

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Vendor Advisories for CVE-2026-61503 (1)

Vendor Pages for CVE-2026-61503 (1)

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

CVE-2026-61500 9.8 CRITICAL Rejetto HFS < 3.2.1 Session Forgery via Predictable Signing Key
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-2026-61505 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-204

V. Comments for CVE-2026-61503

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