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% (97th 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 97th 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% (97th 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% (97th 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:*:*:*:*:*:*:*

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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…
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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…
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