mppx-condition-gate: Free-access path grants on a self-declared wallet without proving control

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

mppx-condition-gate provides conditional free-access wrappers for mppx payment methods. Prior to @insumermodel/mppx-condition-gate 3.0.0 and @insumermodel/mppx-token-gate 1.0.4, the packages read a wallet address from the client-supplied credential.source, checked whether that public address met configured on-chain conditions, and returned a successful free-access receipt without invoking the wrapped payment verifier or proving that the caller controlled the wallet. An unauthenticated attacker could name any qualifying wallet and obtain content that should require payment, and cached grants could be reused for the configured cache lifetime. The corrected packages prevent free-access authorization unless payer control has been established. These issues are fixed in @insumermodel/mppx-condition-gate 3.0.0 and @insumermodel/mppx-token-gate 1.0.4.

Source published

5 Oct 2026 15:55:28 UTC

Source modified

5 Oct 2026 19:53:16 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

CVE Program Terms of Use

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CVSS 3.1 · 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

mppx-condition-gate provides conditional free-access wrappers for mppx payment methods. Prior to @insumermodel/mppx-condition-gate 3.0.0 and @insumermodel/mppx-token-gate 1.0.4, the packages read a wallet address from the client-supplied credential.source, checked whether that public address met configured on-chain conditions, and returned a successful free-access receipt without invoking the wrapped payment verifier or proving that the caller controlled the wallet. An unauthenticated attacker could name any qualifying wallet and obtain content that should require payment, and cached grants could be reused for the configured cache lifetime. The corrected packages prevent free-access authorization unless payer control has been established. These issues are fixed in @insumermodel/mppx-condition-gate 3.0.0 and @insumermodel/mppx-token-gate 1.0.4.

Source published

Oct 5, 2026, 3:55:28 PM (timezone not stated)

Source modified

Oct 5, 2026, 7:53:16 PM (timezone not stated)

Observed here

11 Nov 2026 05:30:39 UTC

Source terms

ENISA EUVD · source terms and attribution apply

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EUVD CVSS 3.1 · 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

mppx-condition-gate provides conditional free-access wrappers for mppx payment methods. Prior to @insumermodel/mppx-condition-gate 3.0.0 and @insumermodel/mppx-token-gate 1.0.4, the packages read a wallet address from the client-supplied credential.source, checked whether that public address met configured on-chain conditions, and returned a successful free-access receipt without invoking the wrapped payment verifier or proving that the caller controlled the wallet. An unauthenticated attacker could name any qualifying wallet and obtain content that should require payment, and cached grants could be reused for the configured cache lifetime. The corrected packages prevent free-access authorization unless payer control has been established. These issues are fixed in @insumermodel/mppx-condition-gate 3.0.0 and @insumermodel/mppx-token-gate 1.0.4.

Source published

5 Oct 2026 16:17:06 UTC

Source modified

6 Oct 2026 16:08:43 UTC

Observed here

25 Oct 2026 04:17:29 UTC

Source terms

NIST NVD usage terms; underlying source attribution retained

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CVSS 3.1 · [email protected] · Secondary · 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

### Impact Both packages wrap an `mppx` payment method so that a wallet meeting on-chain conditions is granted free access instead of being charged. The free-access path reads the payer address from `credential.source` — a client-supplied DID in the payment credential — asks InsumerAPI whether that address satisfies the configured conditions, and on a pass returns a successful receipt **without ever calling the wrapped payment verifier**. Nothing in that path establishes that the caller controls the wallet it named. Because qualifying wallets are public chain state, an attacker does not need to guess one. Naming any qualifying address in `credential.source` is sufficient to obtain free access to a route that should have been paid for. An in-process cache (default TTL 300s, keyed on wallet and conditions) then re-serves the grant without re-evaluating. mppx documents this requirement explicitly. Its type definitions describe `source` as "an asserted identity, not independent proof of control", and state that methods relying on it "must validate the relationship to the credential payload". These packages did not. **This is a defect in these wrapper packages, not in the attestation they consume.** The attestation answers one question — does this wallet satisfy these conditions — and answered it honestly about the address it was given. Binding that address to the caller was the wrapper's responsibility. ### Affected versions Every published version of both packages is affected. The vulnerable control flow is present from the first release of each. ### Patches Fixed releases will not grant free access unless the payer has been proven, and fall through to the paid path wherever no proven payer is available. ### Workarounds Remove the condition gate from the payment method until a fixed version is installed, so all requests take the normal paid path. Alternatively, ensure the wrapped payment method has already bound the credential to the payer before the gate is consulted. ### Credit Reported by @chenshj73, who identified the issue, traced the exact code path, and proposed correct remediations.

Source published

7 Oct 2026 18:03:42 UTC

Source modified

7 Oct 2026 18:15:10 UTC

Observed here

24 Oct 2026 13:17:17 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

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CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Publisher rating · HIGH