139 lines
6.6 KiB
JSON
139 lines
6.6 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-45019",
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"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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"state": "PUBLISHED",
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"assignerShortName": "GitHub_M",
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"dateReserved": "2026-05-08T16:58:28.895Z",
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"datePublished": "2026-08-25T19:20:59.339Z",
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"dateUpdated": "2026-08-27T14:35:27.308Z"
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},
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"containers": {
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"cna": {
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"title": "Chainlit: SSRF via MCP SSE and streamable-http transports allows unauthenticated internal network access",
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-918",
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"lang": "en",
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"description": "CWE-918: Server-Side Request Forgery (SSRF)",
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"type": "CWE"
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}
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]
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"attackComplexity": "LOW",
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"attackVector": "NETWORK",
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"availabilityImpact": "NONE",
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"baseScore": 7.2,
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"baseSeverity": "HIGH",
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"confidentialityImpact": "LOW",
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"integrityImpact": "LOW",
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"privilegesRequired": "NONE",
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"scope": "CHANGED",
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"userInteraction": "NONE",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N",
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"version": "3.1"
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}
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}
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],
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"references": [
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{
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"name": "https://github.com/Chainlit/chainlit/security/advisories/GHSA-hvfh-5mj3-5f3j",
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"tags": [
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"x_refsource_CONFIRM"
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],
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"url": "https://github.com/Chainlit/chainlit/security/advisories/GHSA-hvfh-5mj3-5f3j"
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},
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{
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"name": "https://github.com/Chainlit/chainlit/commit/0565fd0eccb915fce159929598b053ed79f6e0c9",
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"tags": [
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"x_refsource_MISC"
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],
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"url": "https://github.com/Chainlit/chainlit/commit/0565fd0eccb915fce159929598b053ed79f6e0c9"
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},
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{
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"name": "https://github.com/Chainlit/chainlit/blob/2.12.0/docs/security-advisory-2026-mcp.md#spl-2026-002--ssrf-via-mcp-streamable-http--sse",
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"tags": [
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"x_refsource_MISC"
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],
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"url": "https://github.com/Chainlit/chainlit/blob/2.12.0/docs/security-advisory-2026-mcp.md#spl-2026-002--ssrf-via-mcp-streamable-http--sse"
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},
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{
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"name": "https://github.com/Chainlit/chainlit/releases/tag/2.12.0",
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"tags": [
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"x_refsource_MISC"
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],
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"url": "https://github.com/Chainlit/chainlit/releases/tag/2.12.0"
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}
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],
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"affected": [
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{
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"vendor": "Chainlit",
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"product": "chainlit",
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"versions": [
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{
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"version": ">= 2.4.0rc0, < 2.12.0",
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"status": "affected"
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}
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]
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}
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],
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"providerMetadata": {
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"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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"shortName": "GitHub_M",
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"dateUpdated": "2026-08-25T19:20:59.339Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "Chainlit is a Python framework for building production-ready conversational AI applications. From 2.4.0rc0 until 2.12.0, Chainlit deployments with features.mcp.enabled set to true in .chainlit/config.toml expose the POST /mcp endpoint without requiring authentication. For sse and streamable-http transports, ConnectSseMCPRequest and ConnectStreamableHttpMCPRequest in backend/chainlit/types.py accept a user-controlled url and optional headers dictionary without scheme validation, private-address filtering, or an allowlist. The connect_mcp handler in backend/chainlit/server.py passes these values to sse_client() or streamablehttp_client(), allowing the Chainlit server to make blind outbound requests to arbitrary internal or external services, including cloud metadata endpoints, with attacker-controlled Authorization and Cookie headers. The SSE URL sink has existed since 2.4.0rc0, while attacker-controlled header forwarding and streamable-http support were added in 2.6.4. The response is consumed internally and not returned, but the attacker can issue state-changing authenticated requests, discover internal services, scan ports, and probe metadata endpoints. This issue is fixed in version 2.12.0."
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}
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],
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"source": {
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"advisory": "GHSA-hvfh-5mj3-5f3j",
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"discovery": "UNKNOWN"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-08-27T13:54:59.266525Z",
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"id": "CVE-2026-45019",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "yes"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-08-27T14:35:27.308Z"
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}
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}
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]
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}
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} |