# CVE-2026-4858: Path traversal in integration action URL leading to arbitrary API execution via system admin’s auth token.

> CVE-2026-4858: Path traversal in integration action URL leading to arbitrary API execution via system admin’s auth token.. CVSS 8.0 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-4858
Last updated: 2026-07-23T16:10:00Z

- Published: 2026-05-21 08:12 UTC · Updated: 2026-07-23 16:10 UTC · Assigner: Mattermost
- CVSS: 8.0 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
- EPSS: 0.33%, 26th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-22

## Description

Mattermost versions 11.6.x \<= 11.6.0, 11.5.x \<= 11.5.3, 11.4.x \<= 11.4.4, 10.11.x \<= 10.11.14 fail to check integration URL for path traversal which allows an malicious authenticated user  to call an arbitrary API via system admin Mattermost auth token using via path traversal in integration action URL.. Mattermost Advisory ID: MMSA-2026-00640

## Affected vendors and products

- Mattermost: Mattermost

## Tracked companies

- [Mattermost](https://rewindex.com/company/mattermost.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-4858)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-4858)
- [https://mattermost.com/security-updates](https://mattermost.com/security-updates)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-4858 · Markdown: https://rewindex.com/cve/CVE-2026-4858.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-4858 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:09:42.938Z