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Biscuit AuthApplication · Biscuitsec

CVE-2022-31053

CRITICAL · 9.8 CVSS v3.1 Published 2022-06-13
Fix available
A fix is available. Upgrade to 2.0.0 or later.
See remediation →
100/100
Remediation priority · Urgent
Public exploit Remotely reachable No privileges Zero-click

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 · unedited
Biscuit is an authentication and authorization token for microservices architectures. The Biscuit specification version 1 contains a vulnerable algorithm that allows malicious actors to forge valid Γ-signatures. Such an attack would allow an attacker to create a token with any access level. The version 2 of the specification mandates a different algorithm than gamma signatures and as such is not affected by this vulnerability. The Biscuit implementations in Rust, Haskell, Go, Java and Javascript all have published versions following the v2 specification. There are no known workarounds for this issue.

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
How this class of weakness works · CWE-347

The application accepts signed data without properly verifying the signature, so an attacker can forge or tamper with content that the system is meant to trust — tokens, updates, licences. Everything built on that trust then becomes unreliable. Remediation is verifying every signature against the correct key and rejecting anything that does not validate.

General guidance for the improper signature verification class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

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
Biscuit AuthApplication
Affected:>= 1.0.0, <= 1.1.0
Biscuit GoApplication
Affected:< 2.0.0
Biscuit HaskellApplication
Affected:= 0.1.1.0
Biscuit JavaApplication
Affected:< 2.0.0

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
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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 · scoped
Upgrade available Upgrade to 2.0.0 or later
Fixed in 2.0.0
Recommended fix High confidence

Biscuit v2 (specific version varies by language: Go >=2.0.0, Java >=2.0.0, or the respective v2 release for your language implementation)

  1. Identify the specific Biscuit library language implementation used in your project (Auth, Go, Haskell, Java, or JavaScript)
  2. Check the current version of the Biscuit library in your project's dependencies
  3. Upgrade to the v2 release of the respective Biscuit library: For Auth, upgrade to version >1.1.0; For Go, upgrade to version >=2.0.0; For Haskell, upgrade to a version following the v2 specification; For Java, upgrade to version >=2.0.0; For JavaScript, upgrade to a version following the v2 specification
  4. Re-run your test suite to ensure the upgrade does not break existing functionality
  5. Deploy the updated version to your environment
Caveat The v2 specification uses a different signature algorithm than v1; ensure any existing serialized Biscuit tokens are migrated or can still be validated if backward compatibility is required

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $2,300. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2022-31053 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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