Is CVE-2016-8581 in the CISA KEV catalog?

No. CVE-2016-8581 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-8581?

CVE-2016-8581 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2016-8581?

CVE-2016-8581 has an EPSS score of 17.06% (97th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2016-8581

MEDIUMEPSS 97th pctl

6.1

CVSS v3

NVD

Description

A persistent XSS vulnerability exists in the User-Agent header of the login process of AlienVault OSSIM and USM before 5.3.2 that allows an attacker to steal session IDs of logged in users when the current sessions are viewed by an administrator.

CWE-79Cross-Site Scripting (XSS)

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Exploit Intelligence

17.06%probability of exploitation in 30 days

97thpercentile

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

References

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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 2026-05-06.