Is CVE-2026-7864 in the CISA KEV catalog?

No. CVE-2026-7864 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-7864?

CVE-2026-7864 has a CVSS v4 base score of 6.9 (MEDIUM).

What is the EPSS score for CVE-2026-7864?

CVE-2026-7864 has an EPSS score of 17.02% (97th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2026-7864?

No published fix for CVE-2026-7864 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2026-7864

MEDIUMEPSS 97th pctl

6.9

CVSS v4

NVD

Description

SEPPmail Secure Email Gateway before version 15.0.4 exposes server environment variables through an unauthenticated endpoint in the new GINA UI, allowing remote attackers to obtain sensitive system information.

CWE-497

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 v4 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

Impact

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/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

Exploit Intelligence

17.02%probability of exploitation in 30 days

97thpercentile

Very high risk: more likely to be exploited than 97% of all known CVEs.

References

Other references2

Related Vulnerabilities

Other CWE-497 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-31955	Medium	5.5	81%	KEV	Fix
CVE-2025-44823	Critical	9.9	16%	-	Fix
CVE-2025-55131	High	7.1	3.5%	-	Fix
CVE-2026-34413	High	8.6	2.8%	-	-
CVE-2024-13999	Critical	9.8	1.8%	-	Fix
CVE-2024-5735	High	7.5	1.5%	-	Fix

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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 2026-06-17.