CVE-2026-61500
Rejetto HFS < 3.2.1 Session Forgery via Predictable Signing Key
- State
- Published
- Severity
- 9.3 Critical
- Published
- Jul 13, 2026
- Updated
- Oct 1, 2026
- Reserved
- Jul 10, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | 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 | VulnCheck |
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Affected Products
| Product | Versions |
|---|---|
hfsrejetto |
|
References
- hfs v3.2.1 Release Notesrelease-notespatch
- https://www.vulncheck.com/advisories/rejetto-hfs-session-forgery-via-predictable-signing-keythird-party-advisory
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