CVE-2026-61500

Rejetto HFS < 3.2.1 Session Forgery via Predictable Signing Key

Published Jul 13, 2026 CVSS 4.0 · 9.3 Critical EPSS 1.9% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Rejetto http File Server
CPEs cpe:2.3:a:rejetto:http_file_server:*:*:*:*:*:*:*:*
Vendors & Products Rejetto http File Server
Type Values Removed Values Added
First Time appeared Rejetto
Rejetto hfs
Vendors & Products Rejetto
Rejetto hfs
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Rejetto HFS < 3.2.1 Session Forgery via Predictable Signing Key
Weaknesses CWE-338
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Oct 1, 2026, 3:20 PM
Reserved
Jul 10, 2026, 3:43 PM
Status
Deferred
Published
Jul 13, 2026, 6:16 PM
Modified
Oct 24, 2026, 10:10 PM