Exploitation reportedNot in CISA KEV yet

CVE-2026-61500

Exploitation reported by one source. First attested on 2026-10-05 by GCVE · previdian.

Published2026-07-13
WeaknessCWE-338

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2026-07-1318:16CVE publishedNVD
2026-10-0508:32Listed as exploited by GCVEGCVE
2026-10-0508:32Exploitation first reportedGCVE

Observed activity

isMalicious corpus · updated 2026-10-25 15:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-61500?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-61500?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-61500 yet.

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

read 2026-10-25 00:28 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 1 repository, unverifiedaramosf/CVE-2026-61500

Sources

NVDCVE recordread 2026-10-25
GCVEexploitation2026-10-05
CISA-ADPSSVC decisionnone2026-07-15
OpenCVESSVC decisionnone—
CNACVSS 4.09.3read 2026-10-25
CNACVSS 3.19.8read 2026-10-25
CNAweakness (CWE)CWE-338read 2026-10-25
FIRST EPSSEPSS score1.9 %2026-10-25
PoC-in-GitHubproof of concept1read 2026-10-25

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 4.0 vector: 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
Published: 2026-07-13
Last Modified: 2026-10-24
NVD status: Deferred

Frequently asked questions

What is CVE-2026-61500?

Is CVE-2026-61500 actively exploited?

Active exploitation of CVE-2026-61500 has not been confirmed. Its EPSS score was 1.9% on 2026-10-25, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-61500?

CVE-2026-61500 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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