Deploy autonomous AI agents that reason, exploit, and validate complex vulnerability chains — not another scanner, an agentic system that thinks like a senior pentester.
CVE-2020-26276 is a critical severity vulnerability with a CVSS score of 9.8. No known exploits currently, and patches are available.
Lower probability of exploitation
EPSS predicts the probability of exploitation in the next 30 days based on real-world threat data, complementing CVSS severity scores with actual risk assessment.
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 using https://github.com/mattermost/xml-roundtrip-validator.
If upgrade to 3.5.1 is not possible, users should disable SSO authentication in Fleet.
See https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/ for more information about the underlying vulnerabilities.
If you have any questions or comments about this advisory:
| Vendor | Product |
|---|---|
| Fleetdm | Fleet |
Please cite this page when referencing data from Strobes VI. Proper attribution helps support our vulnerability intelligence research.