{"answers":{"affected":"3 open source packages ship an affected version, including mcp-atlassian. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-77271 exists.","fix":"Upgrade mcp-atlassian to 0.22.0 or later.","what":"CVE-2026-77271 is a high-severity path traversal vulnerability in sooperset mcp-atlassian, published on 22 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-77271 and fix it if it is affected.\n\nWhat it is: CVE-2026-77271 is a high-severity path traversal vulnerability in sooperset mcp-atlassian, published on 22 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-77271 exists.\n\nAffected packages and fixed versions:\n- mcp-atlassian (PyPI): affected all versions; fixed in 0.22.0\n- mcp-atlassian (PyPI): affected all versions; fixed in 0.22.0\n- mcp-atlassian (PyPI): affected all versions; fixed in 0.22.0\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-77271/ (Markdown: https://insights.sbomify.com/CVE-2026-77271/index.md)","id":"CVE-2026-77271","markdown":"https://insights.sbomify.com/CVE-2026-77271/index.md","name":"CVE-2026-77271","record":{"aliases":["GHSA-6vmq-24h2-pj7j","PYSEC-2026-4087"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"MCP Atlassian server","requires_auth":"low_privilege","summary":"An incomplete path traversal fix in MCP Atlassian allows attackers to overwrite Python modules within the working directory, leading to remote code execution.","user_interaction":"not_required","vuln_class":"path_traversal"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"mcp_atlassian","vendor":"mcp-atlassian"}],"cvss":{"score":8.3,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-94","name":"Improper Control of Generation of Code"},{"id":"CWE-22","name":"Improper Limitation of a Pathname to a Restricted Directory"}],"description":"MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, validate_safe_path defaults its base directory to os.getcwd(), and affected Confluence attachment call sites omit base_dir, allowing attacker-selected writes within the working directory. This Python module overwrite can provide code execution when the application later imports the modified module, bypassing the remediation tracked as CVE-2026-27825. This issue is fixed in version 0.22.0.","ecosystems":["PyPI"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"MCP Atlassian: Incomplete path traversal fix allows intra-CWD module overwrite and RCE (bypass of CVE-2026-27825)","id":"CVE-2026-77271","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"path_traversal","year":"2026"},"n_packages":3,"n_references":4,"next":{"headline":"MCP Atlassian: Reflected XSS in OAuth Setup Callback Handler","id":"CVE-2026-77272"},"packages":[{"ecosystem":"PyPI","fixed":["0.22.0"],"introduced":["0"],"last_affected":[],"package":"mcp-atlassian","purl":null,"source":"GHSA-6vmq-24h2-pj7j"},{"ecosystem":"PyPI","fixed":["0.22.0"],"introduced":["0"],"last_affected":[],"package":"mcp-atlassian","purl":"pkg:pypi/mcp-atlassian","source":"GHSA-6vmq-24h2-pj7j"},{"ecosystem":"PyPI","fixed":["0.22.0"],"introduced":["0"],"last_affected":[],"package":"mcp-atlassian","purl":"pkg:pypi/mcp-atlassian","source":"PYSEC-2026-4087"}],"prev":{"headline":"MCP Atlassian: Arbitrary File Read via Upload Attachment Tools","id":"CVE-2026-77270"},"products":["mcp-atlassian"],"published":"2026-09-22","related":[{"cvss_score":10,"headline":"[mcp-atlassian] Authentication bypass in HTTP transport: AtlassianOpaqueTokenVerifier accepts any non-empty token","id":"CVE-2026-77244","kev_date_added":null,"published":"2026-09-22"},{"cvss_score":9.1,"headline":"MCP Atlassian: Unauthenticated HTTP MCP requests can use globally configured Jira and Confluence credentials","id":"CVE-2026-77254","kev_date_added":null,"published":"2026-09-22"},{"cvss_score":9.1,"headline":"MCP Atlassian has an arbitrary file write leading to arbitrary code execution via unconstrained download_path in confluence_download_attachment","id":"CVE-2026-27825","kev_date_added":null,"published":"2026-03-10"},{"cvss_score":8.8,"headline":"MCP Atlassian: ENABLED_TOOLS / Toolset authorization bypass","id":"CVE-2026-77243","kev_date_added":null,"published":"2026-09-22"},{"cvss_score":8.8,"headline":"MCP Atlassian: SSRF Protection Bypass","id":"CVE-2026-77274","kev_date_added":null,"published":"2026-09-22"},{"cvss_score":8.6,"headline":"MCP Atlassian: Unauthenticated arbitrary local file read via upload_attachment file_path, chained with missing auth on streamable-http transport","id":"CVE-2026-77248","kev_date_added":null,"published":"2026-09-22"},{"cvss_score":8.6,"headline":"MCP Atlassian: Arbitrary File Read \u0026 Exfiltration (Confused Deputy) in JIRA update_issue","id":"CVE-2026-77255","kev_date_added":null,"published":"2026-09-22"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"PyPA Advisory Database","prefix":"PYSEC"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-24","vendors":["sooperset"]},"summary":"An incomplete path traversal fix in MCP Atlassian allows attackers to overwrite Python modules within the working directory, leading to remote code execution.","url":"https://insights.sbomify.com/CVE-2026-77271/"}