How severe is CVE-2015-8770?

CVE-2015-8770 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2015-8770 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 22% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-8770?

CVE-2015-8770 primarily affects Roundcube Roundcube Webmail. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-8770?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2015-8770 published?

CVE-2015-8770 was published on 2016-01-29 and last updated on 2026-06-17.

CVE-2015-8770

CVE-2015-8770 is a high-severity vulnerability in Roundcube Roundcube Webmail with a CVSS 3.x base score of 7.5. Its EPSS exploit-prediction score of 22% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-22.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 6.0
EPSS exploit prediction: 22% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Roundcube Roundcube Webmail
Published: 2016-01-29
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2015-8770?: CVE-2015-8770 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2015-8770 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 22% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-8770?: CVE-2015-8770 primarily affects Roundcube Roundcube Webmail. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-8770?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2015-8770 published?: CVE-2015-8770 was published on 2016-01-29 and last updated on 2026-06-17.

References

Affected products (5)

cpe:2.3:a:roundcube:roundcube_webmail:*:*:*:*:*:*:*:*
cpe:2.3:a:roundcube:roundcube_webmail:1.1.0:*:*:*:*:*:*:*
cpe:2.3:a:roundcube:roundcube_webmail:1.1.1:*:*:*:*:*:*:*
cpe:2.3:a:roundcube:roundcube_webmail:1.1.2:*:*:*:*:*:*:*
cpe:2.3:a:roundcube:roundcube_webmail:1.1.3:*:*:*:*:*:*:*

More vulnerabilities in Roundcube Roundcube Webmail

CVE-2015-5383 — High (CVSS 7.5): Roundcube Webmail 1.1.x before 1.1.2 allows remote attackers to obtain sensitive information by reading files in the…
CVE-2015-5382 — Medium (CVSS 6.5): program/steps/addressbook/photo.inc in Roundcube Webmail before 1.0.6 and 1.1.x before 1.1.2 allows remote…
CVE-2015-8794 — Medium (CVSS 6.5): Absolute path traversal vulnerability in program/steps/addressbook/photo.inc in Roundcube before 1.0.6 and 1.1.x before…
CVE-2015-5381 — Medium (CVSS 6.1): Cross-site scripting (XSS) vulnerability in program/include/rcmail.php in Roundcube Webmail 1.1.x before 1.1.2 allows…
CVE-2016-4068 — Medium (CVSS 6.1): Cross-site scripting (XSS) vulnerability in Roundcube Webmail before 1.0.9 and 1.1.x before 1.1.5 allows remote…
CVE-2015-8864 — Medium (CVSS 6.1): Cross-site scripting (XSS) vulnerability in Roundcube Webmail before 1.0.9 and 1.1.x before 1.1.5 allows remote…

All CVEs affecting Roundcube Roundcube Webmail →

Other CWE-22 (Path Traversal) vulnerabilities

CVE-2026-76606 — Critical (CVSS 10.0): Joomla Extension - fabrikar.com - Path Traversal via image element in Fabrik < 4.7.3 - ???.
CVE-2026-18051 — Critical (CVSS 10.0): The W3 Total Cache WordPress plugin before 2.10.5 does not properly validate the request path it uses to build cache…
CVE-2026-74764 — Critical (CVSS 10.0): Pandora contains a path traversal vulnerability in its TAR archive extraction functionality. When processing a…
CVE-2026-16940 — Critical (CVSS 10.0): The Custom Fields WordPress plugin before 1.5.1 does not validate a user-supplied file path before deletion, allowing…
CVE-2026-67429 — Critical (CVSS 10.0): Flyto2 Core is an execution kernel for automation and AI-agent workflows. Prior to 2.26.6, image.download and related…
CVE-2026-59555 — Critical (CVSS 10.0): Unauthenticated Arbitrary File Deletion in Participants Database <= 2.7.8.3 versions.

Browse all CWE-22 (Path Traversal) vulnerabilities →