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CVE-2017-11427

31
FAUCET Score

CVE-2017-11427 describes a critical vulnerability in OneLogin PythonSAML 2.3.0 and earlier, where improper handling of XML DOM traversal and canonicalization allows attackers to manipulate SAML data without invalidating cryptographic signatures. This flaw, rated 9.8 CVSS (Critical), enables potential authentication bypass to SAML service providers, leading to high impact on confidentiality, integrity, and availability. While no public exploit code or active exploitation is confirmed, the vulnerability has garnered significant community attention and media coverage, indicating its potential for abuse.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.3.0CPE matchmatch criteria
cpe:2.3:a:onelogin:pythonsaml:*:*:*:*:*:*:*:*
< 2.3.0CPE match
cpe:2.3:a:onelogin:pythonsaml:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.7HIGH

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.1
Impact Score
4.0
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.70%
Probability of exploitation in next 30 days
EPSS Percentile
90.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0470 is in the 85th percentile among its peer group of 36,833 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

pippatch availablevia ghsa
Product: python-samlFixed in: 2.4.0

Vendor Advisories (1)

pipGHSA-j8j8-348v-wfm3high

Python-saml allows manipulation of SAML data without invalidation of cryptographic signature

Jul 5, 2019

References

duo.com / blog/duo-finds-saml-vulnerabilities-affecting-multiple-implementations
ExploitTechnical DescriptionThird Party Advisory
kb.cert.org / vuls/id/475445
Third Party AdvisoryUS Government Resource