{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-77272", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-08-20T19:14:21.330Z", "datePublished": "2026-09-22T18:33:18.421Z", "dateUpdated": "2026-09-23T14:37:43.989Z"}, "containers": {"cna": {"title": "MCP Atlassian: Reflected XSS in OAuth Setup Callback Handler", "problemTypes": [{"descriptions": [{"cweId": "CWE-79", "lang": "en", "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-g2r2-3j32-j27x", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-g2r2-3j32-j27x"}, {"name": "https://github.com/sooperset/mcp-atlassian/pull/1448", "tags": ["x_refsource_MISC"], "url": "https://github.com/sooperset/mcp-atlassian/pull/1448"}, {"name": "https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460", "tags": ["x_refsource_MISC"], "url": "https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460"}, {"name": "https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0"}], "affected": [{"vendor": "sooperset", "product": "mcp-atlassian", "versions": [{"version": "< 0.22.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-22T18:33:18.421Z"}, "descriptions": [{"lang": "en", "value": "MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the OAuth error query parameter is passed to CallbackHandler._send_response in oauth_setup.py and interpolated into an HTML page without escaping. A crafted authorization callback can inject markup or script that executes in the browser of a user completing the OAuth flow. This issue is fixed in version 0.22.0."}], "source": {"advisory": "GHSA-g2r2-3j32-j27x", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-23T14:10:19.747917Z", "id": "CVE-2026-77272", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-23T14:37:43.989Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-77272", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-23T14:10:19.747917Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-23T14:10:20.335Z"}}], "cna": {"title": "MCP Atlassian: Reflected XSS in OAuth Setup Callback Handler", "source": {"advisory": "GHSA-g2r2-3j32-j27x", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.4, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}}], "affected": [{"vendor": "sooperset", "product": "mcp-atlassian", "versions": [{"status": "affected", "version": "< 0.22.0"}]}], "references": [{"url": "https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-g2r2-3j32-j27x", "name": "https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-g2r2-3j32-j27x", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/sooperset/mcp-atlassian/pull/1448", "name": "https://github.com/sooperset/mcp-atlassian/pull/1448", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460", "name": "https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0", "name": "https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the OAuth error query parameter is passed to CallbackHandler._send_response in oauth_setup.py and interpolated into an HTML page without escaping. A crafted authorization callback can inject markup or script that executes in the browser of a user completing the OAuth flow. This issue is fixed in version 0.22.0."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-79", "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-22T18:33:18.421Z"}}}, "cveMetadata": {"cveId": "CVE-2026-77272", "state": "PUBLISHED", "dateUpdated": "2026-09-23T14:37:43.989Z", "dateReserved": "2026-08-20T19:14:21.330Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-09-22T18:33:18.421Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "mcp-atlassian", "vendor": "sooperset", "versions": [{"status": "affected", "version": "< 0.22.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:mcp-atlassian:mcp_atlassian:*:*:*:*:*:*:*:*", "matchCriteriaId": "5B21EB9C-719D-42B9-8F6D-BE4EDC5D39AD", "versionEndExcluding": "0.22.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the OAuth error query parameter is passed to CallbackHandler._send_response in oauth_setup.py and interpolated into an HTML page without escaping. A crafted authorization callback can inject markup or script that executes in the browser of a user completing the OAuth flow. This issue is fixed in version 0.22.0."}], "id": "CVE-2026-77272", "lastModified": "2026-09-28T13:10:43.460", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.5, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.7, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-77272", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-23T14:10:19.747917Z", "version": "2.0.3"}}]}, "published": "2026-09-22T19:16:51.177", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460"}, {"source": "security-advisories@github.com", "tags": ["Issue Tracking", "Patch"], "url": "https://github.com/sooperset/mcp-atlassian/pull/1448"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-g2r2-3j32-j27x"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}