# CVE-2016-10127: PYSEC-2017-67 - PySAML2 allows remote attackers to conduct XML external entity (XXE) attacks via a crafted SAML XML request or response.

Source: https://junglewise.ai/threats/cve-2016-10127-pysaml2-xml-external-entity-attack  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2017-03-03  
License: CC BY 4.0 with a link back

CVE-2016-10127 · Severity: low · CVSS 3 · Published 2017-03-03

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

Technologies: [pysaml2 (PyPI)](https://junglewise.ai/threats/technologies/pypi-pysaml2). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2016-10127 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2016-10127 being exploited in the wild.

**How severe is CVE-2016-10127?** Low severity, with a CVSS score of 3, published 3 March 2017.

**Which products and versions are affected?** pysaml2 (PyPI) ECOSYSTEM:introduced=0,fixed=4.5.0, GIT:introduced=0,fixed=6e09a25d9b4b7aa7a506853210a9a14100b8bc9b|ECOSYSTEM:introduced=0,fixed=4.5.0.

**Is there a fix for CVE-2016-10127?** Yes. pysaml2 (PyPI): upgrade to 4.5.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2016-10127?** Check whether you run pysaml2 (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- pysaml2 (PyPI): upgrade to 4.5.0 or later

  ```sh
  pip install "pysaml2>=4.5.0"
  ```


## Affected products

- pysaml2 (PyPI) ECOSYSTEM:introduced=0,fixed=4.5.0, GIT:introduced=0,fixed=6e09a25d9b4b7aa7a506853210a9a14100b8bc9b|ECOSYSTEM:introduced=0,fixed=4.5.0

## Identifiers

- CVE-2016-10127
- GHSA-m269-wj6g-c459
- PYSEC-2017-67

## Related threats

- [Improper Verification of Cryptographic Signature in PySAML2](https://junglewise.ai/threats/cve-2021-21239-improper-verification-of-cryptographic-signature-in-pysaml2)
- [SAML XML Signature wrapping in PySAML2](https://junglewise.ai/threats/cve-2021-21238-saml-xml-signature-wrapping-in-pysaml2)
- [Improper Verification of Cryptographic Signature in PySAML2](https://junglewise.ai/threats/cve-2020-5390-improper-verification-of-cryptographic-signature-in-pysaml2)
- [pysaml2 Improper Authentication vulnerability](https://junglewise.ai/threats/cve-2017-1000433-pysaml2-improper-authentication-vulnerability)
- [Pysaml2 improperly initializes encryption vector](https://junglewise.ai/threats/cve-2017-1000246-pysaml2-improperly-initializes-encryption-vector)