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

> Attackers with compromised sessions retain account access indefinitely after password changes because active sessions are not invalidated.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 Apr 2026
- **Updated:** 21 Apr 2026
- **Also known as:** GHSA-gqpq-x62g-p4mg

## What is CVE-2026-40587?

CVE-2026-40587 is a medium-severity vulnerability in blueprintue-self-hosted-edition, published on 21 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official 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.

Weakness: CWE-613 (DEPRECATED: Insufficient Session Expiration)

## Which versions are affected by CVE-2026-40587?


## How do I fix CVE-2026-40587?

No fix has been published for CVE-2026-40587 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-40587 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40587 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-40587 and fix it if it is affected.

What it is: CVE-2026-40587 is a medium-severity vulnerability in blueprintue-self-hosted-edition, published on 21 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40587 exists.

Affected product: blueprintue-self-hosted-edition. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-40587/ (Markdown: https://insights.sbomify.com/CVE-2026-40587/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-40587
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40587
- OSV: https://osv.dev/vulnerability/CVE-2026-40587

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-40587/
Summaries are generated and may contain mistakes; the official description above is the record.