CVE-2025-40807
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA vulnerability has been identified in Gridscale X Prepay (All versions < V4.2.1). The affected application is vulnerable to capture-replay of authentication tokens. This could allow an authenticated but already locked-out user to establish still valid user sessions.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceGridscale X Prepay versions before V4.2.1 suffer from a capture-replay vulnerability in their authentication token mechanism. The application's token validation does not properly check account lockout status, allowing previously captured authentication tokens to remain valid even after the associated user account has been locked out. An attacker who has captured valid tokens (e.g., through network interception) can replay them to establish sessions regardless of lockout status.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 4.2.1CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify installed version of Gridscale X PrepayAccess the application administrative interface or check system files for the installed Gridscale X Prepay version number. This is typically found in the About section, system information, or installation logs.Affected if The installed version is before V4.2.1 (e.g., 4.2.0, 4.1.x, earlier versions)
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Verify authentication token mechanism is in useConfirm that the Gridscale X Prepay deployment uses token-based authentication for user sessions. Check authentication configuration or session management settings.Affected if Token-based authentication is enabled and active in the environment
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Confirm account lockout policy is configuredReview the application's security or account policy settings to verify that account lockout functionality is enabled (e.g., after failed login attempts).Affected if Account lockout policy is configured and active
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Test token validity after account lockoutGenerate a valid authentication token for a test account, then lock that account (e.g., via failed login attempts reaching the lockout threshold), and attempt to use the previously captured token to authenticate.Affected if The captured token successfully authenticates after the account has been locked out, indicating the replay vulnerability is present
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Inspect token validation logic configurationReview authentication configuration files or settings related to token validation. Look for whether the validation process includes a check for account lockout status before accepting tokens.Affected if Token validation configuration does not include account lockout status verification, or this check is disabled
A user is affected if Gridscale X Prepay version is below V4.2.1 AND token-based authentication is in use, with the vulnerability confirmed if captured tokens remain valid after their associated user accounts are locked out.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped4.2.1
Upgrade to Gridscale X Prepay V4.2.1 or later. As a compensating control, implement token expiration, single-use token validation, and bind tokens to session/IP to reduce replay window.
4.2.1
- 1. Back up all current configuration and data before upgrading.
- 2. Obtain Gridscale X Prepay version 4.2.1 or later from the vendor's official distribution channel.
- 3. Install or apply the upgrade to the Gridscale X Prepay installation.
- 4. Verify the upgrade completed successfully by checking the application version.
- 5. Test authentication functionality to confirm the capture-replay vulnerability is remediated.
- 6. Verify that locked-out users can no longer establish valid sessions.
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA3.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2025-40807 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-40807 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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