CVE-2015-1796

The PKIX trust engines in Shibboleth Identity Provider before 2.4.4 and OpenSAML Java (OpenSAML-J) before 2.6.5 trust candidate X.509 credentials when no trusted names are available for the entityID, which allows remote attackers to impersonate an entity via a certificate issued by a shibmd:KeyAuthority trust anchor.

Published: 2015-07-08 Last update: 2026-05-06 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2015-1796 is rated Moderate Risk (41.2/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.26%). EPSS rose +1.02% 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-2015-1796

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 0.24% 1.26% +1.02%
2 2025-03-30 0.78% 0.24% -0.55%
3 2025-03-29 — 0.78% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2015-1796

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N 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:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2015-1796

GitHub Security Advisory for CVE-2015-1796

GHSA-78fq-w796-q537 · Severity: medium · Ecosystem: maven — Improper Certificate Validation in Shibboleth Identity Provider and OpenSAML

OS Trackers for CVE-2015-1796

vendor priority summary link
redhat high — https://access.redhat.com/security/cve/CVE-2015-1796
ubuntu medium CVE-2015-1796 medium priority: Ubuntu including 1 source packages (libopensaml2-java), 7 status rows across 7 suites (lucid, precise, trusty, upstream, utopic, vivid, wily): DNE 4, ignored 2, needs-triage 1. https://ubuntu.com/security/CVE-2015-1796

Affected software / configurations for CVE-2015-1796

Vendor Product Version Raw CPE
shibboleth identity_provider <= 2.4.3 cpe:2.3:a:shibboleth:identity_provider:*:*:*:*:*:*:*:*
shibboleth opensaml_java <= 2.6.4 cpe:2.3:a:shibboleth:opensaml_java:*:*:*:*:*:*:*:*

References for CVE-2015-1796

cvelogic Threat Intelligence