CVE-2015-6670

ownCloud Server before 7.0.8, 8.0.x before 8.0.6, and 8.1.x before 8.1.1 does not properly check ownership of calendars, which allows remote authenticated users to read arbitrary calendars via the calid parameter to apps/calendar/export.php.

Published: 2015-10-26 Last update: 2026-05-06 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2015-6670 is rated Moderate Risk (41.5/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.42%). EPSS rose +1.24% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

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

Exploit prediction scoring system (EPSS) score for CVE-2015-6670

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 2026-06-15 0.18% 1.42% +1.24%
2 2025-06-26 0.28% 0.18% -0.11%
3 2025-03-30 — 0.28% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2015-6670

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.0 2.0 MEDIUM
AV:N/AC:L/Au:S/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 8.0 2.9 [email protected]

Weakness enumeration for CVE-2015-6670

OS Trackers for CVE-2015-6670

vendor priority summary link
ubuntu medium CVE-2015-6670 medium priority: Ubuntu including 1 source packages (owncloud), 5 status rows across 5 suites (precise, trusty, upstream, vivid, wily): DNE 3, not-affected 1, released 1. https://ubuntu.com/security/CVE-2015-6670

NVD evaluator notes for CVE-2015-6670

Comment: <a href="http://cwe.mitre.org/data/definitions/639.html">CWE-639: Authorization Bypass Through User-Controlled Key</a>

Affected software / configurations for CVE-2015-6670

Vendor Product Version Raw CPE
owncloud owncloud_server 7.0.0 cpe:2.3:a:owncloud:owncloud_server:7.0.0:*:*:*:*:*:*:*
owncloud owncloud_server 7.0.1 cpe:2.3:a:owncloud:owncloud_server:7.0.1:*:*:*:*:*:*:*
owncloud owncloud_server 7.0.2 cpe:2.3:a:owncloud:owncloud_server:7.0.2:*:*:*:*:*:*:*
owncloud owncloud_server 7.0.3 cpe:2.3:a:owncloud:owncloud_server:7.0.3:*:*:*:*:*:*:*
owncloud owncloud_server 7.0.4 cpe:2.3:a:owncloud:owncloud_server:7.0.4:*:*:*:*:*:*:*
owncloud owncloud_server 7.0.5 cpe:2.3:a:owncloud:owncloud_server:7.0.5:*:*:*:*:*:*:*
owncloud owncloud_server 7.0.6 cpe:2.3:a:owncloud:owncloud_server:7.0.6:*:*:*:*:*:*:*
owncloud owncloud_server 7.0.7 cpe:2.3:a:owncloud:owncloud_server:7.0.7:*:*:*:*:*:*:*
owncloud owncloud_server 8.0.0 cpe:2.3:a:owncloud:owncloud_server:8.0.0:*:*:*:*:*:*:*
owncloud owncloud_server 8.0.2 cpe:2.3:a:owncloud:owncloud_server:8.0.2:*:*:*:*:*:*:*
owncloud owncloud_server 8.0.3 cpe:2.3:a:owncloud:owncloud_server:8.0.3:*:*:*:*:*:*:*
owncloud owncloud_server 8.0.4 cpe:2.3:a:owncloud:owncloud_server:8.0.4:*:*:*:*:*:*:*
owncloud owncloud_server 8.0.5 cpe:2.3:a:owncloud:owncloud_server:8.0.5:*:*:*:*:*:*:*
owncloud owncloud_server 8.1.0 cpe:2.3:a:owncloud:owncloud_server:8.1.0:*:*:*:*:*:*:*

References for CVE-2015-6670

cvelogic Threat Intelligence