Is CVE-2026-61500 in the CISA KEV catalog?

No. CVE-2026-61500 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-61500?

CVE-2026-61500 has a CVSS v3 base score of 9.8 (CRITICAL).

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

CVE-2026-61500 has an EPSS score of 0.75% (51th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2026-61500?

No published fix for CVE-2026-61500 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2026-61500

CRITICAL

9.8

CVSS v3

NVD

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.

CWE-338

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.75%probability of exploitation in 30 days

51stpercentile

Moderate risk: more likely to be exploited than 51% of all known CVEs.

References

Other references2

Related Vulnerabilities

Other CWE-338 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2008-0166	High	7.5	71%	-	Fix
CVE-2009-2367	Critical	9.8	23%	-	-
CVE-2024-29868	Critical	9.1	6.0%	-	-
CVE-2024-31497	Medium	5.9	5.8%	-	Fix
CVE-2021-43799	High	8.6	5.4%	-	Fix
CVE-2008-3280	Medium	5.9	4.0%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-15.