CVE-2017-11427 json
Multiple SAML libraries may allow authentication bypass via incorrect XML canonicalization and DOM traversal
published 7y ago modified 4mo ago also GHSA-j8j8-348v-wfm3 , PYSEC-2019-198 , EUVD-2019-0118
- cvss
- 7.7
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 4.4%
- EPSS 4.4% chance of exploitation in 30 days, percentile 91%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi python-saml 2.4.0
- OneLogin PythonSAML 2.3.0
- python-xmlsec Enterprise Storage 6 1.3.6-1.5.1
- python-isodate Enterprise Storage 6 0.6.0-1.3.2
- python-freezegun Enterprise Storage 6 0.3.12-1.5.1
- python-pkgconfig Enterprise Storage 6 1.5.1-1.5.1
- python-defusedxml Enterprise Storage 6 0.6.0-1.5.1
- python-python3-saml Enterprise Storage 6 1.9.0-1.5.2
suse advisories SUSE-SU-2021:0048-1
- python-python3-saml openSUSE Tumbleweed 1.16.0-2.4
- python-python3-saml openSUSE Tumbleweed 1.15.0-2.3
opensuse advisories openSUSE-SU-2026:12034-1openSUSE-SU-2024:14159-1
Is CVE-2017-11427 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
4.37% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- duo.com https://duo.com/blog/duo-finds-saml-vulnerabilities-affecting-multiple-implementations referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 7.7 | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N |
| NVD | 3.0 | 9.8 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
| GitHub | 3.0 | 7.7 | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | python-saml | <2.4.0 |
2.4.0 |
Affected products
- OneLogin PythonSAML
Classification
- Weakness
-
- CWE-287 Improper Authentication
References
-
github.com
/SAML-Toolkits/python-saml/commit/fad881b4432febea69d70691dfed51c93f0de10f
web
-
duo.com
/blog/duo-finds-saml-vulnerabilities-affecting-multiple-implementations
web, exploit, technical-description, third-party-advisory, article
-
kb.cert.org
/vuls/id/475445
web, third-party-advisory, us-government-resource
-
nvd.nist.gov
/vuln/detail/CVE-2017-11427
advisory
-
github.com
/SAML-Toolkits/python-saml
package
-
github.com
/advisories/GHSA-j8j8-348v-wfm3
advisory
-
github.com
/pypa/advisory-database/tree/main/vulns/python-saml/PYSEC-2019-198.yaml
web
Sources
- CVE List CVE-2017-11427
- GitHub Advisory GHSA-j8j8-348v-wfm3
- NVD CVE-2017-11427
- OSV PYSEC-2019-198
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.