CVE-2026-63464 (GCVE-0-2026-63464)
Vulnerability from cvelistv5 – Published: 2026-09-04 19:44 – Updated: 2026-09-04 19:44
VLAI
EPSS
VEX
Title
Nebula-mesh allows non-admin operators to disable webhook SSRF protection via `allow_private`
Summary
nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. From version 0.6.0 to before version 0.7.2, non-admin operators (role user) can set allow_private: true on their own managed webhook subscription (POST/PATCH /api/v1/webhook-subscriptions). No admin check exists on this field. At delivery time, allow_private switches the dispatcher to an unguarded HTTP client, bypassing the private/loopback/link-local SSRF guard — letting a low-privilege operator make the server request internal addresses. This issue has been patched in version 0.7.2.
Severity
7.7 (High)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/forgekeep/nebula-mesh/security… | x_refsource_CONFIRM |
| https://github.com/forgekeep/nebula-mesh/commit/f… | x_refsource_MISC |
| https://github.com/forgekeep/nebula-mesh/releases… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| forgekeep | nebula-mesh |
Affected:
>= 0.6.0, < 0.7.2
|
guessed |
{
"containers": {
"cna": {
"affected": [
{
"product": "nebula-mesh",
"vendor": "forgekeep",
"versions": [
{
"status": "affected",
"version": "\u003e= 0.6.0, \u003c 0.7.2"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. From version 0.6.0 to before version 0.7.2, non-admin operators (role user) can set allow_private: true on their own managed webhook subscription (POST/PATCH /api/v1/webhook-subscriptions). No admin check exists on this field. At delivery time, allow_private switches the dispatcher to an unguarded HTTP client, bypassing the private/loopback/link-local SSRF guard \u2014 letting a low-privilege operator make the server request internal addresses. This issue has been patched in version 0.7.2."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.7,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "CWE-862: Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-918",
"description": "CWE-918: Server-Side Request Forgery (SSRF)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-04T19:44:10.117Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-7rx3-5wx3-5v76",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-7rx3-5wx3-5v76"
},
{
"name": "https://github.com/forgekeep/nebula-mesh/commit/f3c54530e388dd21763e548923426e60a8e93ff0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/forgekeep/nebula-mesh/commit/f3c54530e388dd21763e548923426e60a8e93ff0"
},
{
"name": "https://github.com/forgekeep/nebula-mesh/releases/tag/v0.7.2",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/forgekeep/nebula-mesh/releases/tag/v0.7.2"
}
],
"source": {
"advisory": "GHSA-7rx3-5wx3-5v76",
"discovery": "UNKNOWN"
},
"title": "Nebula-mesh allows non-admin operators to disable webhook SSRF protection via `allow_private`"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-63464",
"datePublished": "2026-09-04T19:44:10.117Z",
"dateReserved": "2026-07-16T21:37:45.768Z",
"dateUpdated": "2026-09-04T19:44:10.117Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-63464",
"date": "2026-09-05",
"epss": "0.00266",
"percentile": "0.18313"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-63464\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-09-04T20:17:24.730\",\"lastModified\":\"2026-09-04T20:17:24.730\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. From version 0.6.0 to before version 0.7.2, non-admin operators (role user) can set allow_private: true on their own managed webhook subscription (POST/PATCH /api/v1/webhook-subscriptions). No admin check exists on this field. At delivery time, allow_private switches the dispatcher to an unguarded HTTP client, bypassing the private/loopback/link-local SSRF guard \u2014 letting a low-privilege operator make the server request internal addresses. This issue has been patched in version 0.7.2.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"forgekeep\",\"product\":\"nebula-mesh\",\"versions\":[{\"version\":\"\u003e= 0.6.0, \u003c 0.7.2\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N\",\"baseScore\":7.7,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.1,\"impactScore\":4.0}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-862\"},{\"lang\":\"en\",\"value\":\"CWE-918\"}]}],\"references\":[{\"url\":\"https://github.com/forgekeep/nebula-mesh/commit/f3c54530e388dd21763e548923426e60a8e93ff0\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/forgekeep/nebula-mesh/releases/tag/v0.7.2\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-7rx3-5wx3-5v76\",\"source\":\"security-advisories@github.com\"}]}}"
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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