CVE-2026-13426

mediumCVSS 5.4covered by 1 sourcefirst seen 2026-06-26

The Mattermost Go module github.com/mattermost/mattermost/server/public versions < v0.1.22 fail to validate path parameters when constructing API route paths which allows an attacker to redirect API calls to unintended endpoints via crafted IDs containing path traversal components. Mattermost Advisory ID: MMSA-2025-00532

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Exploitation outlook

Low exploitation risk0.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumCVE-2026-13426: The Mattermost Go module github.com/mattermost/mattermost/server/public versions < v0.1.22 fai…nvd · 2026-06-26

External references

NVD record for CVE-2026-13426

CVE.org record

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