Is CVE-2015-8864 in the CISA KEV catalog?

No. CVE-2015-8864 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-8864?

CVE-2015-8864 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2015-8864?

CVE-2015-8864 has an EPSS score of 2.65% (84th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-8864?

Upgrade roundcube on debian 11 to 1.1.5+dfsg.1-1 or later.

CVE & CISA-KEV Catalog

CVE-2015-8864

MEDIUMEPSS 84th pctl

6.1

CVSS v3

NVD

Description

Cross-site scripting (XSS) vulnerability in Roundcube Webmail before 1.0.9 and 1.1.x before 1.1.5 allows remote attackers to inject arbitrary web script or HTML via a crafted SVG, a different vulnerability than CVE-2016-4068.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

roundcubeDebian

Fixed in:1.1.5+dfsg.1-1CVE-2015-8864

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

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

2.65%probability of exploitation in 30 days

84thpercentile

Elevated risk: more likely to be exploited than 84% of all known CVEs.

References

Patch1

github.com

Third-Party Advisory7

Related Vulnerabilities

Other CWE-79 (Cross-Site Scripting (XSS)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-11022	Medium	6.9	99%	-	Fix
CVE-2019-3929	Critical	9.8	99%	KEV	Fix
CVE-2020-9496	Medium	6.1	99%	-	-
CVE-2023-28341	Medium	6.1	99%	-	Fix
CVE-2018-12998	Medium	6.1	98%	-	-
CVE-2025-4123	High	7.6	98%	-	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 2026-05-13.