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CVE-2026-45577

Neotoma: Unauthenticated Inspector/API access via reverse-proxy loopback auth bypass

6.9 MediumFix available

Neotoma provides versioned records that persist across agent runs. From 0.6.0 to before 0.11.1, Neotoma can treat public reverse-proxied requests as local when the app receives them over a loopback socket and no Bearer token is present. In affected deployments, the REST auth middleware can resolve unauthenticated requests as the local development user, making the hosted Inspector and related API surface reachable without credentials. This vulnerability is fixed in 0.11.1.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
None
Availability
None

Exploit likelihood

0.25%Up 0.2 points since May 30, 2026
90%50%10%1%

What each source reports

CVE List Score used 6.9

Neotoma: Unauthenticated Inspector/API access via reverse-proxy loopback auth bypass

Neotoma provides versioned records that persist across agent runs. From 0.6.0 to before 0.11.1, Neotoma can treat public reverse-proxied requests as local when the app receives them over a loopback socket and no Bearer token is present. In affected deployments, the REST auth middleware can resolve unauthenticated requests as the local development user, making the hosted Inspector and related API surface reachable without credentials. This vulnerability is fixed in 0.11.1.

Record
CVE-2026-45577
CVSS 4.0
6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-288, CWE-306
Updated
2026-11-02
EUVDEUVD-2026-33367 6.9

Neotoma provides versioned records that persist across agent runs. From 0.6.0 to before 0.11.1, Neotoma can treat public reverse-proxied requests as local when the app receives them over a loopback socket and no Bearer token is present. In affected deployments, the REST auth middleware can resolve unauthenticated requests as the local development user, making the hosted Inspector and related API surface reachable without credentials. This vulnerability is fixed in 0.11.1.

Record
EUVD-2026-33367
CVSS 4.0
6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-5cvp-p7p4-mcx9 6.9

Neotoma: Unauthenticated Inspector/API access via reverse-proxy loopback auth bypass

Neotoma versions starting at v0.6.0 can treat public reverse-proxied requests as local when the app receives them over a loopback socket and no Bearer token is present.

In affected deployments, the REST auth middleware can resolve unauthenticated requests as the local development user, making the hosted Inspector and related API surface reachable without credentials.

Impact: unauthorized access to production data exposed through the Inspector/API on affected deployments.

Affected condition: a public deployment behind a reverse proxy or same-host tunnel that forwards traffic to the Node process over loopback.

Remediation implemented on the main branch: local-request detection now fails closed in production unless loopback trust is explicitly enabled, and forwarded public clients remain remote.

Patched release version is pending; this draft will be updated once the fix is released.

Record
GHSA-5cvp-p7p4-mcx9
CVSS 4.0
6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-288, CWE-306
Updated
2026-11-02
NVD 6.9

Neotoma provides versioned records that persist across agent runs. From 0.6.0 to before 0.11.1, Neotoma can treat public reverse-proxied requests as local when the app receives them over a loopback socket and no Bearer token is present. In affected deployments, the REST auth middleware can resolve unauthenticated requests as the local development user, making the hosted Inspector and related API surface reachable without credentials. This vulnerability is fixed in 0.11.1.

Record
CVE-2026-45577
CVSS 4.0
6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness
CWE-288, CWE-306
Updated
2026-11-02
OSV 6.9

Neotoma: Unauthenticated Inspector/API access via reverse-proxy loopback auth bypass

Neotoma provides versioned records that persist across agent runs. From 0.6.0 to before 0.11.1, Neotoma can treat public reverse-proxied requests as local when the app receives them over a loopback socket and no Bearer token is present. In affected deployments, the REST auth middleware can resolve unauthenticated requests as the local development user, making the hosted Inspector and related API surface reachable without credentials. This vulnerability is fixed in 0.11.1.

Record
CVE-2026-45577
CVSS 4.0
6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-288, CWE-306
Updated
2026-11-02
OSVGHSA-5cvp-p7p4-mcx9 6.9

Neotoma: Unauthenticated Inspector/API access via reverse-proxy loopback auth bypass

Neotoma versions starting at v0.6.0 can treat public reverse-proxied requests as local when the app receives them over a loopback socket and no Bearer token is present.

In affected deployments, the REST auth middleware can resolve unauthenticated requests as the local development user, making the hosted Inspector and related API surface reachable without credentials.

Impact: unauthorized access to production data exposed through the Inspector/API on affected deployments.

Affected condition: a public deployment behind a reverse proxy or same-host tunnel that forwards traffic to the Node process over loopback.

Remediation implemented on the main branch: local-request detection now fails closed in production unless loopback trust is explicitly enabled, and forwarded public clients remain remote.

Patched release version is pending; this draft will be updated once the fix is released.

Record
GHSA-5cvp-p7p4-mcx9
CVSS 4.0
6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-288, CWE-306
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
neotoma
npm
0.6.0 up to 0.11.1
0.11.1

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-45577 is a medium vulnerability (CVSS 6.9) in Markmhendrickson Neotoma, published May 18, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.25%, the 16th percentile. Fixed in neotoma 0.11.1.

References

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