CVE-2015-8770

Exp

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.

Published: 2016-01-29 Last update: 2026-05-06 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2015-8770 is rated High Exploit Risk (83.2/100): CVSS High severity, with high exploitation likelihood (EPSS 28.30%, 96th percentile). 3 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +4.49% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2015-8770

EDB-ID Source Kind Published Link
39245 exploit_db edb 2016-01-15 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2015-8770

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-04 23.81% 28.30% +4.49%
2 2026-03-01 28.30% 23.81% -4.49%
3 2026-02-04 — 28.30% —

Full EPSS history (37 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2015-8770

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H 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:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.6 5.9 [email protected]
6.0 2.0 MEDIUM
AV:N/AC:M/Au:S/C:P/I:P/A:P 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:S)
A single authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 6.8 6.4 [email protected]

Weakness enumeration for CVE-2015-8770

OS Trackers for CVE-2015-8770

vendor priority summary link
debian not yet assigned CVE-2015-8770 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-2015-8770
gentoo high CVE-2015-8770: 1 GLSA(s) (201603-03), 1 atom(s) (mail-client/roundcube); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2015-8770
ubuntu medium CVE-2015-8770 medium priority: Ubuntu including 1 source packages (roundcube), 12 status rows across 12 suites (artful, bionic, cosmic, disco, precise, trusty, upstream, vivid, wily, xenial, yakkety, zesty): not-affected 7, ignored 3, DNE 1, released 1. https://ubuntu.com/security/CVE-2015-8770

Affected software / configurations for CVE-2015-8770

Vendor Product Version Raw CPE
roundcube roundcube_webmail <= 1.0.7 cpe:2.3:a:roundcube:roundcube_webmail:*:*:*:*:*:*:*:*
roundcube roundcube_webmail 1.1.0 cpe:2.3:a:roundcube:roundcube_webmail:1.1.0:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*

References for CVE-2015-8770

cvelogic Threat Intelligence