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CVE-2017-18909 High

Mattermost Server SAML implementation does not require encryption or signature verification as default

An issue was discovered in Mattermost Server before 3.9.0 when SAML is used. Encryption and signature verification are not mandatory.

Exploit probability 0.7%
Published May 24, 2022
Required by Not available
Last source change February 19, 2026

02 / AFFECTED SOFTWARE

Affected packages

Unknown Unknown

1 explicit affected versions

Go github.com/mattermost/mattermost-server
Go github.com/mattermost/mattermost-server

03 / CONNECTIONS

Connected vulnerabilities

related OPENSUSE-SU-2026:21483-1

04 / EVIDENCE

Source records

Open Source Vulnerabilities CVE-2017-18909

An issue was discovered in Mattermost Server before 3.9.0 when SAML is used. Encryption and signature verification are not mandatory.

View original source
Open Source Vulnerabilities GHSA-r6j5-fqx9-7qv9

An issue was discovered in Mattermost Server before 3.9.0 when SAML is used. Encryption and signature verification are not mandatory.

View original source
Open Source Vulnerabilities GO-2026-4478

Mattermost Server SAML implementation does not require encryption or signature verification as default in github.com/mattermost/mattermost-server. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. (If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.) The additional affected modules and versions are: github.com/mattermost/mattermost-server before v3.8.1-0.20170504181128-4f074fed0d65.

View original source

05 / REFERENCES

Further evidence