{"items":[{"id":"NVI-00015313","kind":"vulnerability","title":"MCP Atlassian: SSRF Protection Bypass","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-hgcf-4mq8-5266","CVE-2026-77274"],"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-5a874fbf587b49ea40fac279fa7cebdc"],"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":[],"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-5a874fbf587b49ea40fac279fa7cebdc","url":"https://github.com/advisories/GHSA-hgcf-4mq8-5266","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-hgcf-4mq8-5266","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T14:29:31.527Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-5a874fbf587b49ea40fac279fa7cebdc"],"technology":"mcp-atlassian","known_exclusions":[],"conditions_summary":"## Environment\n\n- Project: `sooperset/mcp-atlassian`\n- Affected function: `validate_url_for_ssrf()`\n- Affected path: header-based Jira/Confluence URL authentication flow\n- Tested endpoint: `POST /mcp`\n- Tested version: `2.14.5`\n\n## Description\n\nThe SSRF protection in `validate_url_for_ssrf()` can be bypassed with a URL containing a backslash before userinfo-like syntax.\n\nAffected code:\n\n```python\nparsed = urlparse(url)\nhostname = parsed.hostname\n...\nip_error = _check_ip_address(hostname)\n...\ndns_error = _check_dns_resolution(hostname)\n```\n\nPayload:\n\n```text\nhttp://127.0.0.1:6666\\@www.baidu.com\n```\n\nFor this input, `urllib.parse.urlparse()` treats the hostname as:\n\n```text\nwww.baidu.com\n```\n\nTherefore, `validate_url_for_ssrf()` validates `www.baidu.com` instead of `127.0.0.1`. However, the downstream request made through the Atlassian client / `requests.Session` reaches the local service:\n\n```text\nhttp://127.0.0.1:6666/%5C@www.baidu.com/rest/api/2/myself\n```\n\nThis allows an attacker-controlled Jira URL to target loopback or internal services.\n\n## Proof of Concept\n\nStart a local HTTP server:\n\n```bash\npython3 -m http.server 6666 --bind 127.0.0.1\n```\n\nStart `mcp-atlassian` with streama","public_affected_ranges":["< 0.22.0"]}],"null_published_at":"2026-11-03T10:03:26.569Z","source_updated_at":"2026-09-22T20:36:23.000Z","source_disclosed_at":"2026-09-22T20:36:22.000Z","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":"40769"}