CVE-2026-31381
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 · uneditedAn attacker can extract user email addresses (PII) exposed in base64 encoding via the state parameter in the OAuth callback URL.
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 confidenceThe OAuth implementation exposes user email addresses (PII) in base64-encoded form through the state parameter in the callback URL. An attacker who intercepts or observes the OAuth callback can decode the base64 strings to extract user email addresses.
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 dataall versionsCVSS 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
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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 Gainsight Assist installationCheck for Gainsight Assist by querying installed applications, checking for the product directory, or reviewing software inventory systemsAffected if Gainsight Assist is present in the environment
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Capture an OAuth callback URLInitiate an OAuth login flow with Gainsight Assist and capture the resulting callback URL (the redirect_uri with parameters)Affected if The callback URL contains a 'state' parameter with base64-encoded data
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Decode the state parameter valueTake the value of the 'state' parameter from the OAuth callback and decode it from base64 formatAffected if The decoded base64 string contains an email address or other PII such as [email protected]
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Verify email exposure in state parameterCompare the decoded email address against the user account that initiated the OAuth flowAffected if The decoded email matches the actual user email and is transmitted through the state parameter in clear text after base64 decoding
A user is affected if Gainsight Assist is deployed and OAuth callback URLs contain base64-encoded email addresses in the state parameter that decode to actual user email addresses.
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 dataRemove email addresses and other PII from the OAuth state parameter; use opaque random state tokens instead, and retrieve user profile data through authenticated API calls after token exchange.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-31381 — 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-2026-31381 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
- No spam, self-promotion, credentials, or personal data