Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2020-26276

10.0 · CRITICAL

Fleet is an open source osquery manager.

Published Dec 17, 2020CWE-290EPSS 2.20%

Overview

CVE-2020-26276 is a critical-severity vulnerability. It was published on December 17, 2020 and has a CVSS 3.1 base score of 10.0 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 10.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Fleet is an open source osquery manager. In Fleet before version 3.5.1, due to issues in Go's standard library XML parsing, a valid SAML response may be mutated by an attacker to modify the trusted document. This can result in allowing unverified logins from a SAML IdP. Users that configure Fleet with SSO login may be vulnerable to this issue. This issue is patched in 3.5.1. The fix was made using https://github.com/mattermost/xml-roundtrip-validator If upgrade to 3.5.1 is not possible, users should disable SSO authentication in Fleet.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/fleetdm/fleet/blob/master/CHANGELOG.md#fleet-351-dec-14-2020GitHubgithub.com/fleetdm/fleet/commit/57812a532e5f749c8e18c6f6a652eca65c083607GitHubgithub.com/fleetdm/fleet/security/advisories/GHSA-w3wf-cfx3-6gcxGitHubgithub.com/mattermost/xml-roundtrip-validatorRefmattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilitiesGitHubgithub.com/fleetdm/fleet/blob/master/CHANGELOG.md#fleet-351-dec-14-2020GitHubgithub.com/fleetdm/fleet/commit/57812a532e5f749c8e18c6f6a652eca65c083607GitHubgithub.com/fleetdm/fleet/security/advisories/GHSA-w3wf-cfx3-6gcxGitHubgithub.com/mattermost/xml-roundtrip-validatorRefmattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities

How CyberStrike helps

Frequently asked questions

What is CVE-2020-26276?

CVE-2020-26276 is a critical-severity vulnerability. It was published on December 17, 2020 and has a CVSS 3.1 base score of 10.0 (CRITICAL).

How severe is CVE-2020-26276?

This vulnerability has a CVSS 3.1 base score of 10.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2020-26276?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2020-26276?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-26276 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related CRITICAL CVEs from 2020

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999