CVE-2016-10127

PySAML2 allows remote attackers to conduct XML external entity (XXE) attacks via a crafted SAML XML request or response.

Published: 2017-03-03 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-10127 is rated Moderate Risk (58.1/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.47%). 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-2016-10127

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 2026-01-21 0.83% 0.47% -0.36%
2 2025-03-30 2.30% 0.83% -1.47%
3 2025-03-29 — 2.30% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-10127

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.0 3.0 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/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:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
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.
 2.3 6.0 [email protected]
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/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:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2016-10127

GitHub Security Advisory for CVE-2016-10127

GHSA-m269-wj6g-c459 · Severity: critical · Ecosystem: pip — PySAML2 XML external entity attack

OS Trackers for CVE-2016-10127

vendor priority summary link
debian unimportant CVE-2016-10127 unimportant priority: Debian including 1 source packages (python-pysaml2), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 5. https://security-tracker.debian.org/tracker/CVE-2016-10127
redhat medium — https://access.redhat.com/security/cve/CVE-2016-10127
suse high CVE-2016-10127 severity important: SUSE including 166 source package names (ardana-ansible-8.0+git.1566374355.c509923-3.67.3, ardana-glance-8.0+git.1566376789.be0fe01-3.17.3, …), 347 product×package rows across 6 product lines (HPE Helion OpenStack 8, SUSE Enterprise Storage 4, … (6 product lines)): Fixed 347. https://www.suse.com/security/cve/CVE-2016-10127/
ubuntu low CVE-2016-10127 low priority: Ubuntu including 1 source packages (python-pysaml2), 9 status rows across 9 suites (artful, bionic, cosmic, precise, trusty, upstream, xenial, yakkety, zesty): ignored 3, not-affected 3, DNE 2, released 1. https://ubuntu.com/security/CVE-2016-10127

Affected software / configurations for CVE-2016-10127

Vendor Product Version Raw CPE
pysaml2_project pysaml2 — cpe:2.3:a:pysaml2_project:pysaml2:-:*:*:*:*:*:*:*

References for CVE-2016-10127

cvelogic Threat Intelligence