CVE-2026-61500
9.3
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
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| rejetto | hfs | 3.0.0 < 3.2.1 | affected |
Weaknesses
- CWE-338: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
References
- https://github.com/rejetto/hfs/releases/tag/v3.2.1
- https://www.vulncheck.com/advisories/rejetto-hfs-session-forgery-via-predictable-signing-key
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