What is CVE-2015-8770?

CVE-2015-8770 is a high-severity vulnerability in Roundcube Webmail, classified under Path Traversal. CVSS score: 7.5/10. Published 2016-01-29.

How severe is CVE-2015-8770?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2015-8770 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Path Traversal in Roundcube Webmail

CVE-2015-8770

Directory traversal vulnerability in the set_skin function in program/include/rcmail_output_html.php in Roundcube before 1.0.8 and 1.1.x before 1.1.4 allows remote authenticated users with certain permissions to read arbitrary files or possibly execute arbitrary code via a .. (dot dot) in the _skin parameter to index.php.

Vulnerability class: Path Traversal (Directory Traversal)

Published 2016-01-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.224 (97.6th percentile), scored 2026-09-30.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 97.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.224 · newest: 0.224 · change: 0.000

Affected products

Roundcube Webmail — versions 1.1.0, 1.1.1, 1.1.2

Weakness classification (CWE)

CWE-22 — Path Traversal

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

security.gentoo.org/glsa/201603-03 (vendor-advisory)
www.debian.org/security/2016/dsa-3541 (vendor-advisory)
trac.roundcube.net/changeset/10e5192a2b/github
www.securityfocus.com/archive/1/537304/100/0/threaded (mailing-list)
lists.opensuse.org/opensuse-security-announce/2016-01/msg00030.html (vendor-advisory)
roundcube.net/news/2015/12/26/updates-1.1.4-and-1.0.8-released/ (Patch, Vendor Advisory)
lists.opensuse.org/opensuse-security-announce/2016-01/msg00028.html (vendor-advisory)
trac.roundcube.net/ticket/1490620
packetstormsecurity.com/files/135274/Roundcube-1.1.3-Path-Traversal.html (Exploit)
www.exploit-db.com/exploits/39245/ (exploit)

Frequently asked questions

What is CVE-2015-8770?: CVE-2015-8770 is a high-severity vulnerability in Roundcube Webmail, classified under Path Traversal. CVSS score: 7.5/10. Published 2016-01-29.
How severe is CVE-2015-8770?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2015-8770 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.