CVE-2026-77339 (GCVE-0-2026-77339)
Vulnerability from cvelistv5
Published
2026-09-18 16:37
Modified
2026-09-18 16:49
Severity ?
VLAI Severity ?
EPSS score ?
Summary
Process Compose is a scheduler and orchestrator for non-containerized applications. Prior to 1.120.0, the MCP SSE listener in src/mcp/server.go accepts browser-origin requests to /sse and the returned message endpoint without validating the Host header, validating the Origin header, or authenticating the caller. When MCP SSE is enabled, a malicious website can use DNS rebinding to reach the loopback listener and issue MCP requests. If expose_control_tools is enabled, the attacker can enumerate process state, read or search logs, truncate logs, and start, stop, restart, or scale local processes; configured user-defined tools can expose additional commands and output. The Gin REST API token middleware does not protect this separately started MCP listener. This issue is fixed in version 1.120.0.
References
| URL | Tags | |
|---|---|---|
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| F1bonacc1 | process-compose |
Version: < 1.120.0 |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-77339",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-18T16:49:18.961229Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-09-18T16:49:46.487Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"exploit"
],
"url": "https://github.com/F1bonacc1/process-compose/security/advisories/GHSA-5gm3-9crp-6g3v"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "process-compose",
"vendor": "F1bonacc1",
"versions": [
{
"status": "affected",
"version": "\u003c 1.120.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Process Compose is a scheduler and orchestrator for non-containerized applications. Prior to 1.120.0, the MCP SSE listener in src/mcp/server.go accepts browser-origin requests to /sse and the returned message endpoint without validating the Host header, validating the Origin header, or authenticating the caller. When MCP SSE is enabled, a malicious website can use DNS rebinding to reach the loopback listener and issue MCP requests. If expose_control_tools is enabled, the attacker can enumerate process state, read or search logs, truncate logs, and start, stop, restart, or scale local processes; configured user-defined tools can expose additional commands and output. The Gin REST API token middleware does not protect this separately started MCP listener. This issue is fixed in version 1.120.0."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 5.1,
"baseSeverity": "MEDIUM",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "LOW",
"subIntegrityImpact": "HIGH",
"userInteraction": "PASSIVE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:H/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "LOW",
"vulnIntegrityImpact": "LOW"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-306",
"description": "CWE-306: Missing Authentication for Critical Function",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-346",
"description": "CWE-346: Origin Validation Error",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-18T16:37:19.072Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/F1bonacc1/process-compose/security/advisories/GHSA-5gm3-9crp-6g3v",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/F1bonacc1/process-compose/security/advisories/GHSA-5gm3-9crp-6g3v"
},
{
"name": "https://github.com/F1bonacc1/process-compose/commit/6ffa74f462cd2fa4f8dc1ee63c70b793b298c858",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/F1bonacc1/process-compose/commit/6ffa74f462cd2fa4f8dc1ee63c70b793b298c858"
},
{
"name": "https://github.com/F1bonacc1/process-compose/releases/tag/v1.120.0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/F1bonacc1/process-compose/releases/tag/v1.120.0"
}
],
"source": {
"advisory": "GHSA-5gm3-9crp-6g3v",
"discovery": "UNKNOWN"
},
"title": "Process Compose: Browser DNS rebinding lets websites control local process-compose MCP tools"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-77339",
"datePublished": "2026-09-18T16:37:19.072Z",
"dateReserved": "2026-08-20T19:24:11.618Z",
"dateUpdated": "2026-09-18T16:49:46.487Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"vulnrichment": {
"containers": "{\"cna\": {\"title\": \"Process Compose: Browser DNS rebinding lets websites control local process-compose MCP tools\", \"problemTypes\": [{\"descriptions\": [{\"cweId\": \"CWE-306\", \"lang\": \"en\", \"description\": \"CWE-306: Missing Authentication for Critical Function\", \"type\": \"CWE\"}]}, {\"descriptions\": [{\"cweId\": \"CWE-346\", \"lang\": \"en\", \"description\": \"CWE-346: Origin Validation Error\", \"type\": \"CWE\"}]}], \"metrics\": [{\"cvssV4_0\": {\"attackVector\": \"NETWORK\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"PASSIVE\", \"vulnConfidentialityImpact\": \"LOW\", \"vulnIntegrityImpact\": \"LOW\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"LOW\", \"subIntegrityImpact\": \"HIGH\", \"subAvailabilityImpact\": \"NONE\", \"baseScore\": 5.1, \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:H/SA:N\", \"version\": \"4.0\"}}], \"references\": [{\"name\": \"https://github.com/F1bonacc1/process-compose/security/advisories/GHSA-5gm3-9crp-6g3v\", \"tags\": [\"x_refsource_CONFIRM\"], \"url\": \"https://github.com/F1bonacc1/process-compose/security/advisories/GHSA-5gm3-9crp-6g3v\"}, {\"name\": \"https://github.com/F1bonacc1/process-compose/commit/6ffa74f462cd2fa4f8dc1ee63c70b793b298c858\", \"tags\": [\"x_refsource_MISC\"], \"url\": \"https://github.com/F1bonacc1/process-compose/commit/6ffa74f462cd2fa4f8dc1ee63c70b793b298c858\"}, {\"name\": \"https://github.com/F1bonacc1/process-compose/releases/tag/v1.120.0\", \"tags\": [\"x_refsource_MISC\"], \"url\": \"https://github.com/F1bonacc1/process-compose/releases/tag/v1.120.0\"}], \"affected\": [{\"vendor\": \"F1bonacc1\", \"product\": \"process-compose\", \"versions\": [{\"version\": \"\u003c 1.120.0\", \"status\": \"affected\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-09-18T16:37:19.072Z\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Process Compose is a scheduler and orchestrator for non-containerized applications. Prior to 1.120.0, the MCP SSE listener in src/mcp/server.go accepts browser-origin requests to /sse and the returned message endpoint without validating the Host header, validating the Origin header, or authenticating the caller. When MCP SSE is enabled, a malicious website can use DNS rebinding to reach the loopback listener and issue MCP requests. If expose_control_tools is enabled, the attacker can enumerate process state, read or search logs, truncate logs, and start, stop, restart, or scale local processes; configured user-defined tools can expose additional commands and output. The Gin REST API token middleware does not protect this separately started MCP listener. This issue is fixed in version 1.120.0.\"}], \"source\": {\"advisory\": \"GHSA-5gm3-9crp-6g3v\", \"discovery\": \"UNKNOWN\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-77339\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-18T16:49:18.961229Z\"}}}], \"references\": [{\"url\": \"https://github.com/F1bonacc1/process-compose/security/advisories/GHSA-5gm3-9crp-6g3v\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-09-18T16:49:41.201Z\"}}]}",
"cveMetadata": "{\"cveId\": \"CVE-2026-77339\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"GitHub_M\", \"dateReserved\": \"2026-08-20T19:24:11.618Z\", \"datePublished\": \"2026-09-18T16:37:19.072Z\", \"dateUpdated\": \"2026-09-18T16:49:46.487Z\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…