# CVE-2026-93848: Mattermost OpenID discovery endpoint request bypasses outbound connection filtering, allowing SSRF by a System Administrator

> CVE-2026-93848: Mattermost OpenID discovery endpoint request bypasses outbound connection filtering, allowing SSRF by a System Administrator. CVSS 2.7 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-93848
Last updated: 2026-11-02T18:38:09Z

- Published: 2026-10-26 14:28 UTC · Updated: 2026-11-02 18:38 UTC · Assigner: Mattermost
- CVSS: 2.7 (CVSS 3.1) · Severity: Low · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
- EPSS: 0.29%, 22th percentile (scored 2026-11-03)
- CISA KEV: no
- CWE: CWE-918

## Description

Mattermost versions 11.7.x \<= 11.7.10 fail to apply outbound internal-connection filtering to the OpenID discovery endpoint request which allows a System Administrator to determine whether internal addresses and ports are reachable from the server via an unauthenticated login request that triggers the discovery fetch.. Mattermost Advisory ID: MMSA-2026-00774

## 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-2026-93848)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-93848)
- [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-2026-93848 · Markdown: https://rewindex.com/cve/CVE-2026-93848.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-93848 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-04T14:37:39.598Z