{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2025-6515 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2025-6515 yet. Limit exposure of the affected software until one is available.","what":"CVE-2025-6515 is a medium-severity authentication bypass vulnerability in oatpp-mcp, published on 20 Oct 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2025-6515 and fix it if it is affected.\n\nWhat it is: CVE-2025-6515 is a medium-severity authentication bypass vulnerability in oatpp-mcp, published on 20 Oct 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2025-6515 in the wild and no public exploit code.\n\nAffected product: oatpp-mcp. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2025-6515/ (Markdown: https://insights.sbomify.com/CVE-2025-6515/index.md)","id":"CVE-2025-6515","markdown":"https://insights.sbomify.com/CVE-2025-6515/index.md","name":"CVE-2025-6515","record":{"aliases":["GHSA-rvw9-mm8q-456q"],"analysis":{"component_type":"library","fix_type":"patch","impacts":["account_takeover","data_modify"],"network_reachable":"yes","non_default_config":false,"product_category":"oatpp-mcp library","requires_auth":"none","summary":"Remote attackers can hijack MCP sessions by guessing predictable session IDs, allowing them to intercept and modify server responses.","user_interaction":"required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"JFROG","cpe":[],"cvss":{"score":6.8,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-330","name":"Use of Insufficiently Random Values"}],"description":"The MCP SSE endpoint in oatpp-mcp returns an instance pointer as the session ID, which is not unique nor cryptographically secure. This allows network attackers with access to the oatpp-mcp server to guess future session IDs and hijack legitimate client MCP sessions, returning malicious responses from the oatpp-mcp server.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Reuse of session IDs in oatpp-mcp leads to session hijacking and prompt hijacking by remote attackers","id":"CVE-2025-6515","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"auth_bypass","year":"2025"},"n_packages":0,"n_references":1,"next":{"headline":"HDF5 H5Fint.c H5F_addr_decode_len heap-based overflow","id":"CVE-2025-6516"},"packages":[],"prev":{"headline":"OS command injection in mcp-remote when connecting to untrusted MCP servers","id":"CVE-2025-6514"},"products":["oatpp-mcp"],"published":"2025-10-20","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2025-10-20","vendors":["oatpp"]},"summary":"Remote attackers can hijack MCP sessions by guessing predictable session IDs, allowing them to intercept and modify server responses.","url":"https://insights.sbomify.com/CVE-2025-6515/"}