CVE-2026-61500

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Source
https://cve.org/CVERecord?id=CVE-2026-61500
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61500.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-61500
Published
2026-07-13T17:21:55.747Z
Modified
2026-07-15T01:49:08.022770057Z
Severity
  • 9.3 (Critical) CVSS_V4 - 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 CVSS Calculator
Summary
Rejetto HFS < 3.2.1 Session Forgery via Predictable Signing Key
Details

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.

Database specific 
{
    "cna_assigner": "VulnCheck",
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "introduced": "3.0.0"
                },
                {
                    "fixed": "3.2.1"
                }
            ]
        }
    ],
    "cwe_ids": [
        "CWE-338"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61500.json"
}
References

Affected packages

Git / github.com/rejetto/hfs

Affected ranges

Type
GIT
Repo
https://github.com/rejetto/hfs
Events
Introduced
72b005c14cd3d11e0ef3afa3c9fa46bc07af444a
Fixed
2ab771834b4198c2e65e44453d50fd8e3be308de
Database specific 
{
    "source": "DESCRIPTION",
    "extracted_events": [
        {
            "introduced": "3.0.0"
        },
        {
            "fixed": "3.2.0"
        }
    ]
}

Affected versions

v3.*
v3.0.0
v3.0.1
v3.0.2
v3.0.3
v3.0.4
v3.0.5
v3.0.6
v3.0.7
v3.1.0
v3.1.0-alpha1
v3.1.0-alpha3
v3.1.0-beta4
v3.1.0-beta5
v3.1.0-beta6
v3.1.0-rc10
v3.1.0-rc11
v3.1.0-rc12
v3.1.0-rc7
v3.1.0-rc8
v3.1.0-rc9
v3.1.1
v3.1.2
v3.1.3
v3.1.4
v3.1.5
v3.1.7

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61500.json"