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CVE-2026-61500

Rejetto HFS < 3.2.1 Session Forgery via Predictable Signing Key

Published: Jul 13, 2026Updated: Jul 15, 2026 Sources: CVE List NVDCWE-338
9.8CRITICAL
NVD MITRE
EPSS Score
0.7%
Top 47.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-338

Affected Products

rejetto
commercial
hfsMixed
Networking Infrastructure / network-management

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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References

https://github.com/rejetto/hfs/releases/tag/v3.2.1
github.com
https://www.vulncheck.com/advisories/rejetto-hfs-session-forgery-via-predictable-signing-key
vulncheck.com

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