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Vulnerabilities CVE-2026-61500

CVE-2026-61500

Critical
Open
TLP:CLEAR

Rejetto HFS < 3.2.1 Session Forgery via Predictable Signing Key

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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.

Details

CVSS Score
9.3
EPSS Score
0.75%

51.6th percentile

CVSS 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
Confidence
90%
Published
Jul 13, 2026
Last Modified
Jul 15, 2026
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