CVE-2026-61500
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.
Early warning: exploitation observed
- Exploitation observed since Oct 1, 2026
- Not yet in the official CISA catalogue
- First attack observed 79 days after disclosure
- Confirmed by sensors, not only by reports
Source: VulnCheck KEV · Oct 5, 2026 Oct 4, 2026 Oct 2, 2026 Oct 2, 2026 Oct 2, 2026 Oct 1, 2026
CVSS score9.8 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HWeakness type (CWE)CWE-338
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