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6 vulnerabilities by langbot-app
CVE-2026-54449 (GCVE-0-2026-54449)
Vulnerability from nvd – Published: 2026-08-20 16:10 – Updated: 2026-08-20 16:10
VLAI
EPSS
VEX
Title
LangBot: Authenticated RCE Via MCP Configuration
Summary
LangBot is a global IM bot platform designed for LLMs. In version 4.10.7 and earlier, any authenticated user can add or change an STDIO MCP server configuration without an adequate authorization boundary. In src/langbot/pkg/provider/tools/loaders/mcp.py, StdioServerParameters accepts the configured command and arguments and starts a server-side subprocess on the LangBot server. An attacker who can sign up or obtain an account can use the Extensions MCP configuration to execute arbitrary commands with the privileges of the LangBot service, enabling data disclosure, modification, and service disruption. No fixed version is available as of this review.
Severity
8.8 (High)
CWE
- CWE-77 - Improper Neutralization of Special Elements used in a Command ('Command Injection')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/langbot-app/LangBot/security/a… | x_refsource_CONFIRM |
| https://www.ox.security/blog/mcp-supply-chain-adv… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| langbot-app | LangBot |
Affected:
<= 4.10.7
|
{
"containers": {
"cna": {
"affected": [
{
"product": "LangBot",
"vendor": "langbot-app",
"versions": [
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}
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}
],
"descriptions": [
{
"lang": "en",
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}
],
"metrics": [
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"attackVector": "NETWORK",
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"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-77",
"description": "CWE-77: Improper Neutralization of Special Elements used in a Command (\u0027Command Injection\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-20T16:10:25.169Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
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"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/langbot-app/LangBot/security/advisories/GHSA-3pvh-63gf-j9mw"
},
{
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"tags": [
"x_refsource_MISC"
],
"url": "https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem"
}
],
"source": {
"advisory": "GHSA-3pvh-63gf-j9mw",
"discovery": "UNKNOWN"
},
"title": "LangBot: Authenticated RCE Via MCP Configuration"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-54449",
"datePublished": "2026-08-20T16:10:25.169Z",
"dateReserved": "2026-06-15T15:30:40.317Z",
"dateUpdated": "2026-08-20T16:10:25.169Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-28509 (GCVE-0-2026-28509)
Vulnerability from nvd – Published: 2026-03-06 04:16 – Updated: 2026-03-06 16:07
VLAI
EPSS
VEX
Title
LangBot has a Cross Site Scripting(XSS) Vulnerability
Summary
LangBot is a global IM bot platform designed for LLMs. Prior to version 4.8.7, LangBot’s web UI renders user-supplied raw HTML using rehypeRaw, which can lead to a cross-site scripting (XSS) vulnerability. This issue has been patched in version 4.8.7.
Severity
6.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-06 15:50 UTC
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/langbot-app/LangBot/security/a… | x_refsource_CONFIRM |
| https://github.com/langbot-app/LangBot/commit/614… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| langbot-app | LangBot |
Affected:
< 4.8.7
|
{
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"id": "CVE-2026-28509",
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"timestamp": "2026-03-06T15:50:37.548729Z",
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"vendor": "langbot-app",
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}
],
"metrics": [
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"attackVector": "NETWORK",
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"scope": "UNCHANGED",
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}
}
],
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"description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
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}
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],
"providerMetadata": {
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},
"references": [
{
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"tags": [
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],
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},
{
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],
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}
],
"source": {
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"discovery": "UNKNOWN"
},
"title": "LangBot has a Cross Site Scripting(XSS) Vulnerability"
}
},
"cveMetadata": {
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"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-28509",
"datePublished": "2026-03-06T04:16:58.761Z",
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"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
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}
CVE-2025-59835 (GCVE-0-2025-59835)
Vulnerability from nvd – Published: 2025-10-02 18:59 – Updated: 2025-10-02 19:50
VLAI
EPSS
VEX
Title
LangBot has a cross-directory file upload vulnerability, which could lead to system takeover
Summary
LangBot is a global IM bot platform designed for LLMs. In versions 4.1.0 up to but not including 4.3.5, authorized attackers can exploit the /api/v1/files/documents interface to perform arbitrary file uploads. Since this interface does not strictly restrict the storage directory of files on the server, it is possible to upload dangerous files to specific system directories. This is fixed in version 4.3.5.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-02 19:50 UTC
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/langbot-app/LangBot/security/a… | x_refsource_CONFIRM |
| https://github.com/langbot-app/LangBot/pull/1691 | x_refsource_MISC |
| https://github.com/langbot-app/LangBot/releases/t… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| langbot-app | LangBot |
Affected:
>= 4.1.0, < 4.3.5
|
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},
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}
],
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"timestamp": "2025-10-02T19:50:28.048098Z",
"version": "2.0.3"
},
"type": "ssvc"
}
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],
"providerMetadata": {
"dateUpdated": "2025-10-02T19:50:39.752Z",
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"vendor": "langbot-app",
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}
],
"metrics": [
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"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 8.6,
"baseSeverity": "HIGH",
"privilegesRequired": "LOW",
"subAvailabilityImpact": "HIGH",
"subConfidentialityImpact": "HIGH",
"subIntegrityImpact": "HIGH",
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"problemTypes": [
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]
},
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"cweId": "CWE-434",
"description": "CWE-434: Unrestricted Upload of File with Dangerous Type",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
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},
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}
],
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"discovery": "UNKNOWN"
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CVE-2026-54449 (GCVE-0-2026-54449)
Vulnerability from cvelistv5 – Published: 2026-08-20 16:10 – Updated: 2026-08-20 16:10
VLAI
EPSS
VEX
Title
LangBot: Authenticated RCE Via MCP Configuration
Summary
LangBot is a global IM bot platform designed for LLMs. In version 4.10.7 and earlier, any authenticated user can add or change an STDIO MCP server configuration without an adequate authorization boundary. In src/langbot/pkg/provider/tools/loaders/mcp.py, StdioServerParameters accepts the configured command and arguments and starts a server-side subprocess on the LangBot server. An attacker who can sign up or obtain an account can use the Extensions MCP configuration to execute arbitrary commands with the privileges of the LangBot service, enabling data disclosure, modification, and service disruption. No fixed version is available as of this review.
Severity
8.8 (High)
CWE
- CWE-77 - Improper Neutralization of Special Elements used in a Command ('Command Injection')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/langbot-app/LangBot/security/a… | x_refsource_CONFIRM |
| https://www.ox.security/blog/mcp-supply-chain-adv… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| langbot-app | LangBot |
Affected:
<= 4.10.7
|
{
"containers": {
"cna": {
"affected": [
{
"product": "LangBot",
"vendor": "langbot-app",
"versions": [
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}
]
}
],
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}
],
"metrics": [
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"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
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"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"providerMetadata": {
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"tags": [
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],
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}
],
"source": {
"advisory": "GHSA-3pvh-63gf-j9mw",
"discovery": "UNKNOWN"
},
"title": "LangBot: Authenticated RCE Via MCP Configuration"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-54449",
"datePublished": "2026-08-20T16:10:25.169Z",
"dateReserved": "2026-06-15T15:30:40.317Z",
"dateUpdated": "2026-08-20T16:10:25.169Z",
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CVE-2026-28509 (GCVE-0-2026-28509)
Vulnerability from cvelistv5 – Published: 2026-03-06 04:16 – Updated: 2026-03-06 16:07
VLAI
EPSS
VEX
Title
LangBot has a Cross Site Scripting(XSS) Vulnerability
Summary
LangBot is a global IM bot platform designed for LLMs. Prior to version 4.8.7, LangBot’s web UI renders user-supplied raw HTML using rehypeRaw, which can lead to a cross-site scripting (XSS) vulnerability. This issue has been patched in version 4.8.7.
Severity
6.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-06 15:50 UTC
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/langbot-app/LangBot/security/a… | x_refsource_CONFIRM |
| https://github.com/langbot-app/LangBot/commit/614… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| langbot-app | LangBot |
Affected:
< 4.8.7
|
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}
],
"metrics": [
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"attackVector": "NETWORK",
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"userInteraction": "REQUIRED",
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CVE-2025-59835 (GCVE-0-2025-59835)
Vulnerability from cvelistv5 – Published: 2025-10-02 18:59 – Updated: 2025-10-02 19:50
VLAI
EPSS
VEX
Title
LangBot has a cross-directory file upload vulnerability, which could lead to system takeover
Summary
LangBot is a global IM bot platform designed for LLMs. In versions 4.1.0 up to but not including 4.3.5, authorized attackers can exploit the /api/v1/files/documents interface to perform arbitrary file uploads. Since this interface does not strictly restrict the storage directory of files on the server, it is possible to upload dangerous files to specific system directories. This is fixed in version 4.3.5.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-02 19:50 UTC
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/langbot-app/LangBot/security/a… | x_refsource_CONFIRM |
| https://github.com/langbot-app/LangBot/pull/1691 | x_refsource_MISC |
| https://github.com/langbot-app/LangBot/releases/t… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| langbot-app | LangBot |
Affected:
>= 4.1.0, < 4.3.5
|
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