CVE-2025-43840
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 · uneditedCross-Site Request Forgery (CSRF) vulnerability in ref CheckBot checkbot allows Stored XSS.This issue affects CheckBot: from n/a through <= 1.05.
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 confidenceCross-Site Request Forgery (CSRF) vulnerability in CheckBot allows attackers to trick authenticated users into executing unintended actions that result in Stored XSS. The lack of CSRF token validation on state-changing operations enables malicious script injection that persists and executes in other users' contexts.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS 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
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
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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Confirm CheckBot installation and versionLocate CheckBot installation and identify the installed version number. Compare against any available version history or release notes.Affected if Running any version of CheckBot without CSRF protection documentation
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Identify state-changing operationsReview CheckBot's functionality for features that modify data: settings changes, user profile updates, bot configuration changes, or any action that persists data to storage.Affected if State-changing operations exist in the CheckBot instance
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Inspect HTML forms for CSRF token presenceView page source or intercept HTTP requests when performing any state-changing action. Check if a CSRF token parameter or header is included in form submissions.Affected if State-changing forms lack CSRF token fields or validation
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Verify SameSite cookie attributesInspect HTTP response headers for Set-Cookie directives. Check if SameSite attribute is set to Strict or Lax, or if secure sessions are configured.Affected if Cookies are set without SameSite attribute or with SameSite=None without Secure flag
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Test for XSS injection via CSRFCreate a malicious page that triggers a state-changing request to CheckBot with XSS payload in a parameter that gets stored. If the payload executes after authentication, the vulnerability is present.Affected if XSS payloads injected through CSRF-enabled actions persist and execute in user contexts
The environment is affected if CheckBot is running and state-changing operations lack CSRF token validation, allowing Stored XSS injection.
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.
From vendor dataImplement anti-CSRF tokens for all state-changing operations and enforce strict input validation/output encoding to prevent XSS injection. Additionally, implement SameSite cookie attributes.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-43840 — 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-2025-43840 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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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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