CVE-2026-48612
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 · uneditedImproper state verification in the OAuth implementation could allow an attacker to manipulate the authentication flow and cause a victim’s account to be linked to an attacker-controlled account. This can result in unauthorized account linking and potential account takeover.
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 confidenceThis is an OAuth state parameter validation vulnerability. The OAuth protocol uses a 'state' parameter to prevent CSRF attacks by verifying that the callback matches the original authorization request. Improper implementation means the state is either not validated, uses predictable values, or fails to verify ownership, allowing an attacker to craft a malicious authorization flow that links the victim's account to the attacker's OAuth identity.
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
- High
- Privileges
- Low
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
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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Verify state parameter is included in authorization requestsInspect your OAuth authorization URL construction code and confirm the 'state' parameter is being generated and appended to the authorization endpoint URL (e.g., https://authprovider.com/authorize?client_id=...&state=...)Affected if The 'state' parameter is missing from the authorization request entirely
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Confirm state is cryptographically random and uniqueReview the code that generates the state value - it should use a cryptographically secure random number generator (e.g., CSPRNG, random_bytes, secrets module) and produce values with sufficient entropy (minimum 128-bit) that are unique per requestAffected if The state uses predictable values (e.g., sequential numbers, timestamps alone, base64-encoded user ID) or a weak random function (e.g., mt_rand, Math.random)
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Ensure state is stored or bound to the user's sessionCheck that the generated state is stored server-side (database, session store, cache) or encoded in a signed token (JWT with signature) tied to the user's session before redirecting to the authorization providerAffected if The state is not persisted or bound to the initiating user's session, allowing an attacker to inject their own state value
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Validate state on callback before processingExamine the OAuth callback handler code - it must retrieve the state from the callback URL, compare it against the stored/session-bound state, and reject the flow if it does not match or is missingAffected if The callback endpoint does not validate the state parameter, accepts any value, or only checks if a state exists without verifying it matches the original request
You are affected if your OAuth implementation either omits the state parameter, uses predictable/non-random state values, fails to bind state to the user's session, or does not validate state on the callback endpoint.
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 proper OAuth state parameter validation: generate a cryptographically random, unique state value for each authorization request (stored server-side or as a signed token), and validate it matches on the callback before linking accounts.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-48612 — 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-2026-48612 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
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