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CVE

CVE-2026-61500

Rejetto HFS < 3.2.1 Session Forgery via Predictable Signing Key
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CVE

CVE-2026-61500

Rejetto HFS < 3.2.1 Session Forgery via Predictable Signing Key

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.3
-
4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61500.json, https://nvd.nist.gov/vuln/detail/CVE-2026-61500, https://www.vulncheck.com/advisories/rejetto-hfs-session-forgery-via-predictable-signing-key, https://github.com/rejetto/hfs/releases/tag/v3.2.1, https://github.com/rejetto/hfs

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.00857%
EPSS Percentile
0.55784%
Introduced Version
72b005c14cd3d11e0ef3afa3c9fa46bc07af444a
Fix Available
15f0eb32f856016b6a3a04c8679b9a12eb18c203

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