{"items":[{"id":"NVI-00016361","kind":"vulnerability","title":"MCP Atlassian: Arbitrary File Read & Exfiltration (Confused Deputy) in JIRA update_issue","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-2xj6-xx86-cwwc","CVE-2026-77255"],"plain_summary":"GitHub lists this reviewed advisory for mcp-atlassian. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-0b8b65ba5b860082928409c271f21586"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-09-22T20:34:55.000Z","value":"8.6 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-6abf9ad699de6ea271179378094ca5c8"},{"kind":"EPSS","as_of":"2026-11-05T12:03:04.000Z","value":"0.459%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.39926. Missing scores are unknown.","source_id":"sr-0b8b65ba5b860082928409c271f21586"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-6abf9ad699de6ea271179378094ca5c8","url":"https://github.com/advisories/GHSA-2xj6-xx86-cwwc","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-2xj6-xx86-cwwc","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T14:29:31.527Z"},{"id":"sr-0b8b65ba5b860082928409c271f21586","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-77255","publisher":"FIRST EPSS","observed_at":"2026-11-06T07:17:46.398Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-6abf9ad699de6ea271179378094ca5c8"],"technology":"mcp-atlassian","known_exclusions":[],"conditions_summary":"### Summary\nA critical Confused Deputy (Arbitrary File Read & Exfiltration) vulnerability in the Atlassian MCP server (Python) allows an AI agent to exfiltrate sensitive host files and environment secrets. By providing absolute system paths to the attachments parameter of the update_issue tool, an agent can force the privileged MCP process to read and upload any file it has access to—including its own environment variables and host configuration—directly to a Jira ticket.\n\n### Details\nThe vulnerability is located in the update_issue tool handler. The attachments parameter accepts a list of file paths that are passed directly to the Jira API's upload method without any sanitization or validation. \n\nSpecifically, the implementation fails to:\n1.  Restrict paths to a safe workspace: It accepts absolute paths starting with /.\n2.  Prevent directory traversal: It does not filter for ../ sequences.\n3.  Validate ownership: It allows the process to read system-level files (like /proc/self/environ) that the calling agent is normally forbidden from accessing due to sandbox restrictions.\n\nBecause the MCP server typically runs with higher privileges than the AI agent (holding the JIRA_API_TOKEN ","public_affected_ranges":["< 0.22.0"]}],"null_published_at":"2026-11-08T15:11:49.423Z","source_updated_at":"2026-09-22T20:34:55.000Z","source_disclosed_at":"2026-09-22T20:34:52.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-11-01T14:29:31.527Z"},{"id":"NVI-00016361","kind":"vulnerability","title":"MCP Atlassian: Arbitrary File Read & Exfiltration (Confused Deputy) in JIRA update_issue","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-2xj6-xx86-cwwc","CVE-2026-77255"],"plain_summary":"GitHub lists this reviewed advisory for mcp-atlassian. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-6abf9ad699de6ea271179378094ca5c8"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-09-22T20:34:55.000Z","value":"8.6 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-6abf9ad699de6ea271179378094ca5c8"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-6abf9ad699de6ea271179378094ca5c8","url":"https://github.com/advisories/GHSA-2xj6-xx86-cwwc","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-2xj6-xx86-cwwc","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T14:29:31.527Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-6abf9ad699de6ea271179378094ca5c8"],"technology":"mcp-atlassian","known_exclusions":[],"conditions_summary":"### Summary\nA critical Confused Deputy (Arbitrary File Read & Exfiltration) vulnerability in the Atlassian MCP server (Python) allows an AI agent to exfiltrate sensitive host files and environment secrets. By providing absolute system paths to the attachments parameter of the update_issue tool, an agent can force the privileged MCP process to read and upload any file it has access to—including its own environment variables and host configuration—directly to a Jira ticket.\n\n### Details\nThe vulnerability is located in the update_issue tool handler. The attachments parameter accepts a list of file paths that are passed directly to the Jira API's upload method without any sanitization or validation. \n\nSpecifically, the implementation fails to:\n1.  Restrict paths to a safe workspace: It accepts absolute paths starting with /.\n2.  Prevent directory traversal: It does not filter for ../ sequences.\n3.  Validate ownership: It allows the process to read system-level files (like /proc/self/environ) that the calling agent is normally forbidden from accessing due to sandbox restrictions.\n\nBecause the MCP server typically runs with higher privileges than the AI agent (holding the JIRA_API_TOKEN ","public_affected_ranges":["< 0.22.0"]}],"null_published_at":"2026-11-04T10:04:27.935Z","source_updated_at":"2026-09-22T20:34:55.000Z","source_disclosed_at":"2026-09-22T20:34:52.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-01T14:29:31.527Z"}],"next_cursor":null,"snapshot_revision":"42594"}