{"id":"CVE-2026-77251","title":"MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira)","summary":"MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, Jira search accepts a forbidden project clause because it checks only for the presence of project syntax, Confluence se…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-1276","CWE-184","CWE-693","CWE-863"],"vendor":"mcp-atlassian","product":"mcp_atlassian","affected":["mcp_atlassian < 0.22.0"],"patched":["mcp_atlassian 0.22.0"],"published":"2026-09-22","updated":"2026-09-29","sourceUpdated":"2026-09-29T14:21:29.180","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77251","references":[{"url":"https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460","label":"security-advisories@github.com"},{"url":"https://github.com/sooperset/mcp-atlassian/pull/1448","label":"security-advisories@github.com"},{"url":"https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0","label":"security-advisories@github.com"},{"url":"https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-w66g-j6c4-hcfc","label":"security-advisories@github.com"},{"url":"https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-w66g-j6c4-hcfc","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77251"},{"url":"https://github.com/advisories/GHSA-w66g-j6c4-hcfc"},{"url":"https://github.com/sooperset/mcp-atlassian"},{"url":"https://pypi.org/project/mcp-atlassian"}],"tags":["nvd","cve.org","exploit-available","ghsa","pip","osv"],"epss":0.00266,"epssPercentile":0.18376,"aliases":["GHSA-w66g-j6c4-hcfc","PYSEC-2026-4102"],"ecosystem":"pip","exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"total","timestamp":"2026-09-25T23:56:09.407715Z"},"scores":{"nvd":6.5,"cna":8.3},"ingestedAt":"2026-09-22T18:08:12.471Z","slug":"CVE-2026-77251","body":"## Overview\n\nMCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, Jira search accepts a forbidden project clause because it checks only for the presence of project syntax, Confluence search uses an incomplete case-sensitive space check, and Jira board APIs omit project-filter enforcement. These paths expose issues, boards, or pages outside JIRA_PROJECTS_FILTER or CONFLUENCE_SPACES_FILTER when the operator credentials have broader access. The advisory traces the vulnerable input and processing flow through jira_search, confluence_search, get_board_issues, get_agile_boards, JIRA_PROJECTS_FILTER, and CONFLUENCE_SPACES_FILTER, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.\n\n## Affected\n\n- `mcp_atlassian < 0.22.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `mcp_atlassian 0.22.0`\n\n## Package advisory (CVE-2026-77251)\n\nAffected packages:\n\n- `mcp-atlassian < 0.22.0`\n\nPatched in:\n\n- `mcp-atlassian 0.22.0`\n\nSource: https://github.com/advisories/GHSA-w66g-j6c4-hcfc","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":212741,"id":"CVE-2026-77251","ts":1790700023950,"field":"cvss","old":"8.3","new":"6.5"},{"seq":212740,"id":"CVE-2026-77251","ts":1790700023950,"field":"severity","old":"high","new":"medium"},{"seq":212720,"id":"CVE-2026-77251","ts":1790695472255,"field":"cvss","old":"6.5","new":"8.3"},{"seq":212719,"id":"CVE-2026-77251","ts":1790695472255,"field":"severity","old":"medium","new":"high"},{"seq":212684,"id":"CVE-2026-77251","ts":1790692638475,"field":"cvss","old":"8.3","new":"6.5"},{"seq":212683,"id":"CVE-2026-77251","ts":1790692638475,"field":"severity","old":"high","new":"medium"},{"seq":211220,"id":"CVE-2026-77251","ts":1790382261807,"field":"exploit_available","old":"false","new":"true"}]}