What’s Vulnerable › Vulnerabilities

CVE-2018-21264

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-06-19 · updated 2026-06-17
• Weakness: CWE-20

Description

An issue was discovered in Mattermost Server before 4.7.0, 4.6.2, and 4.5.2. It did not enforce the expiration date of a SAML response.

Affected products

• Mattermost: before 4.5.2; from 4.6.0 before 4.6.2; 4.7.0-rc1, 4.7.0-rc2, 4.7.0-rc3, 4.7.0-rc4 — fixed in 4.5.2, 4.6.2

How to fix

Upgrade to a fixed version: Mattermost 4.5.2, 4.6.2. Check the vendor advisory for mitigations.

References

• https://mattermost.com/security-updates/
• https://mattermost.com/security-updates/

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