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CVE-2026-61500

CRITICAL
9.8
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-61500
State
PUBLISHED
Assigner
VulnCheck
Reserved
2026-07-10 15:43 UTC
Published
2026-07-13 17:21 UTC
Last updated
2026-07-13 17:21 UTC
Primary CWE
CWE-338
Use of Cryptographically Weak Pseudo-Random Number Generator…
Vendor / Product
rejetto / hfs
Sources
cve.org  ·  NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products (1)
VendorProductPlatformVersions
rejetto hfs — 3.0.0 < 3.2.1
Weakness (CWE)
CWESourceDescription
CWE-338 cna Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
CVSS scores (2)
ScoreSeverityVersionSourceVector
9.8 CRITICAL 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3 CRITICAL 4.0 cna 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
References (2)
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