CVE-2017-11427 | Multiple SAML libraries may allow authentication bypass via incorrect XML canonicalization and DOM traversal

Exp

OneLogin PythonSAML 2.3.0 and earlier may incorrectly utilize the results of XML DOM traversal and canonicalization APIs in such a way that an attacker may be able to manipulate the SAML data without invalidating the cryptographic signature, allowing the attack to potentially bypass authentication to SAML service providers.

Published: 2019-04-17 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-11427 is rated High Exploit Risk (75.4/100): CVSS High severity, with medium exploitation likelihood (EPSS 3.43%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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

Public exploit references (Exploit-DB) for CVE-2017-11427

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2017-11427

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 2026-06-03 4.55% 3.43% -1.13%
2 2026-05-05 2.54% 4.55% +2.02%
3 2026-04-20 — 2.54% —

Full EPSS history (19 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-11427

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.7 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N 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:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
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:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.1 4.0 [email protected]
9.8 3.0 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/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:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
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.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/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:L)
Exploitation conditions are straightforward and predictable.
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.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2017-11427

GitHub Security Advisory for CVE-2017-11427

GHSA-j8j8-348v-wfm3 · Severity: high · Ecosystem: pip — Python-saml allows manipulation of SAML data without invalidation of cryptographic signature

OS Trackers for CVE-2017-11427

vendor priority summary link
suse critical CVE-2017-11427 severity critical: SUSE including 17 source package names (python-python3-saml, python3-defusedxml-0.6.0-1.5.1, …), 20 product×package rows across 8 product lines (SUSE Enterprise Storage 6, SUSE Linux Enterprise Module for Basesystem 15 SP2, … (8 product lines)): Fixed 18, Known Not Affected 2. https://www.suse.com/security/cve/CVE-2017-11427/

Affected software / configurations for CVE-2017-11427

Vendor Product Version Raw CPE
onelogin pythonsaml <= 2.3.0 cpe:2.3:a:onelogin:pythonsaml:*:*:*:*:*:*:*:*

References for CVE-2017-11427

URL Tags
https://duo.com/blog/duo-finds-saml-vulnerabilities-affecting-multiple-implementations Exploit Technical Description Third Party Advisory
https://www.kb.cert.org/vuls/id/475445 Third Party Advisory US Government Resource
cvelogic Threat Intelligence