CVE-2015-8864 [Medium]

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.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-01-21	0.37%	0.48%	+0.11%
2	2025-09-16	0.73%	0.37%	-0.36%
3	2025-03-25	—	0.73%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-01-21

0.37%

0.48%

+0.11%

2025-09-16

0.73%

0.37%

-0.36%

2025-03-25

—

0.73%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.1	3.0	MEDIUM	`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:N) Service keeps running; no real outage angle.	2.8	2.7	[email protected]
4.3	2.0	MEDIUM	`AV:N/AC:M/Au:N/C:N/I:P/A:N` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:M) Exploitation needs some favorable conditions, but not exceptional ones. Authentication (AU:N) No authentication is required. Confidentiality impact (C:N) No confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:N) No availability impact.	8.6	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.1

3.0

MEDIUM

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

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L): Some sensitive info could get out, but not a total data dump.
Integrity (I:L): Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N): Service keeps running; no real outage angle.

2.8

2.7

[email protected]

4.3

2.0

MEDIUM

AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:M): Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:N): No confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:N): No availability impact.

8.6

2.9

[email protected]

OS Trackers for CVE-2015-8864

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2015-8864 not yet assigned priority: Debian including 1 source packages (roundcube), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2015-8864
`ubuntu`	medium	CVE-2015-8864 medium priority: Ubuntu including 1 source packages (roundcube), 11 status rows across 11 suites (artful, bionic, cosmic, disco, precise, trusty, upstream, wily, xenial, yakkety, zesty): ignored 5, not-affected 4, DNE 1, released 1.	https://ubuntu.com/security/CVE-2015-8864

Affected software / configurations for CVE-2015-8864

Vendor	Product	Version	Raw CPE
opensuse	leap	42.1	cpe:2.3:o:opensuse:leap:42.1:::::::*
opensuse	opensuse	13.1	cpe:2.3:o:opensuse:opensuse:13.1:::::::*
opensuse	opensuse	13.2	cpe:2.3:o:opensuse:opensuse:13.2:::::::*
roundcube	roundcube_webmail	1.1.1	cpe:2.3:a:roundcube:roundcube_webmail:1.1.1:::::::*
roundcube	roundcube_webmail	1.1.2	cpe:2.3:a:roundcube:roundcube_webmail:1.1.2:::::::*
roundcube	roundcube_webmail	1.1.3	cpe:2.3:a:roundcube:roundcube_webmail:1.1.3:::::::*
roundcube	webmail	<= 1.0.8	cpe:2.3:a:roundcube:webmail::::::::
roundcube	webmail	1.1	cpe:2.3:a:roundcube:webmail:1.1:::::::*
roundcube	webmail	1.1	cpe:2.3:a:roundcube:webmail:1.1:beta::::::
roundcube	webmail	1.1	cpe:2.3:a:roundcube:webmail:1.1:rc::::::
roundcube	webmail	1.1.4	cpe:2.3:a:roundcube:webmail:1.1.4:::::::*

References for CVE-2015-8864

URL	Tags
http://lists.opensuse.org/opensuse-updates/2016-08/msg00078.html	Third Party Advisory
http://lists.opensuse.org/opensuse-updates/2016-08/msg00079.html	Third Party Advisory
http://lists.opensuse.org/opensuse-updates/2016-08/msg00095.html	Third Party Advisory
https://github.com/roundcube/roundcubemail/commit/40d7342dd9c9bd2a1d613edc848ed95a4d71aa18	Patch Third Party Advisory
https://github.com/roundcube/roundcubemail/issues/4949	Third Party Advisory
https://github.com/roundcube/roundcubemail/releases/tag/1.0.9	Release Notes Third Party Advisory
https://github.com/roundcube/roundcubemail/releases/tag/1.1.5	Release Notes Third Party Advisory
https://github.com/roundcube/roundcubemail/wiki/Changelog#release-115	Release Notes Third Party Advisory

URL

CVE-2015-8864

Exploit prediction scoring system (EPSS) score for CVE-2015-8864

Common vulnerability scoring system (CVSS) metrics for CVE-2015-8864

Weakness enumeration for CVE-2015-8864

OS Trackers for CVE-2015-8864

Affected software / configurations for CVE-2015-8864

References for CVE-2015-8864