GHSA-63cq-34vq-4f48Published

Obot before v0.23.0 Authentication Bypass via Registry API

Collected exploitation and prediction evidence

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.

cve-program · CVE-2026-101063

Published

Obot versions before v0.23.0 fail to enforce authentication on MCP Registry endpoints under /v0.1/* when registry authentication is enabled. Unauthenticated attackers can read registry metadata including server names, descriptions, repository URLs, and connect URLs by sending GET requests to /v0.1/servers.

Source published: 27 Sep 2026 20:49:54 UTC
Source modified: 28 Sep 2026 13:49:35 UTC
Observed here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: cve-program · CVE Program Terms of Use. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 4.0 · 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS 3.1 · 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

euvd · EUVD-2026-88032

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Sep 27, 2026, 8:49:54 PM

dateUpdated: Sep 28, 2026, 1:49:35 PM

Source published: Sep 27, 2026, 8:49:54 PM (timezone not stated)
Source modified: Sep 28, 2026, 1:49:35 PM (timezone not stated)
Observed here: 11 Nov 2026 05:27:59 UTC
Source terms: ENISA EUVD · source terms and attribution apply

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EUVD CVSS 4.0 · 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

nvd · CVE-2026-101063

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Deferred

Weakness classifications: CWE-862

Original publisher date fields

published: 2026-09-27T21:17:01.757

lastModified: 2026-09-28T21:02:16.150

Source published: 27 Sep 2026 21:17:01 UTC
Source modified: 28 Sep 2026 21:02:16 UTC
Observed here: 25 Oct 2026 04:17:26 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 4.0 · [email protected] · Secondary · 6.9 CVSS: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

CVSS 3.1 · [email protected] · Secondary · 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

osv · GHSA-pr6h-vr44-xq8j

Published

## Summary In affected versions, enabling registry authentication (`OBOT_SERVER_ENABLE_REGISTRY_AUTH=true`) does not actually protect the MCP Registry endpoints under `/v0.1/*` — they remain readable by unauthenticated callers. ## Am I affected? You are affected if you run Obot `<= v0.22.1` with `OBOT_SERVER_ENABLE_REGISTRY_AUTH=true`. An unauthenticated `GET /v0.1/servers` returns `200 OK` with catalog server metadata. (With registry auth disabled, the registry is intentionally public and this is not a defect.) ## Details The authorizer rejects a fixed set of known-protected prefixes and then default-allows everything else. The registry is mounted at the top-level `/v0.1` prefix, which was not in that set, so anonymous requests were authorized before the `WWW-Authenticate` challenge for `/v0.1` was ever reached. The registry handler still applies its own per-user ACR filtering, so an anonymous caller receives only entries accessible to the anonymous identity (e.g. default-catalog/wildcard entries), and responses contain names, descriptions, repository URLs, icons, and connect URLs — not secret env/header values. This is the same root cause as GHSA-vw82-7fv8-r6gp, whose fix protected `/mcp-connect/` but not the `/v0.1` registry prefix. ## Impact Worst case is disclosure of the registry server inventory (names, descriptions, repository URLs, connect URLs) that the operator explicitly chose to put behind authentication. No credential values are exposed and unauthenticated users cannot connect to the servers because connecting is properly protected by auth. ## Mitigation Upgrade to **v0.23.0** or later, in which the `/v0.1` registry prefix is treated as a protected route so authentication is enforced for unauthenticated callers. ## Severity CVSS v3.1 Score: **5.3/10 (Medium)** — `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N` ## Credits The Obot team would like to thank HE WEI（ギカク）(https://www.linkedin.com/in/gikaku, [@hewei-gikaku](https://github.com/hewei-gikaku)) for responsibly disclosing this issue in accordance with our [security policy](https://github.com/obot-platform/obot/?tab=security-ov-file).

Source published: 18 Sep 2026 17:59:40 UTC
Source modified: 28 Sep 2026 17:10:43 UTC
Observed here: 24 Oct 2026 13:19:41 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

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

Publisher rating · MODERATE

osv · GO-2026-6525

Published

Obot: MCP Registry API readable without authentication in github.com/obot-platform/obot

Source published: 28 Sep 2026 16:43:40 UTC
Source modified: 28 Sep 2026 17:10:43 UTC
Observed here: 24 Oct 2026 13:19:41 UTC
Source terms: OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · OSV · upstream source license applies. Source text is retained; field grouping and change labels are provided by ChangeIntel.