{"answers":{"affected":"3 open source packages ship an affected version, including pycti. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-21887 in the wild and no public exploit code.","fix":"Upgrade pycti to 6.8.16 or later.","what":"CVE-2026-21887 is a high-severity server-side request forgery vulnerability in OpenCTI-Platform opencti, published on 12 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-21887 and fix it if it is affected.\n\nWhat it is: CVE-2026-21887 is a high-severity server-side request forgery vulnerability in OpenCTI-Platform opencti, published on 12 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-21887 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- pycti (PyPI): affected all versions; fixed in 6.8.16\n- pycti (PyPI): affected all versions; fixed in 6.8.16\n- pycti (PyPI): affected all versions; fixed in 6.8.16\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-2026-21887/ (Markdown: https://insights.sbomify.com/CVE-2026-21887/index.md)","id":"CVE-2026-21887","markdown":"https://insights.sbomify.com/CVE-2026-21887/index.md","name":"CVE-2026-21887","record":{"aliases":["GHSA-ffm6-vvph-g5f5","PYSEC-2026-118"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["data_read","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Threat Intelligence Platform","requires_auth":"low_privilege","summary":"Attackers can exploit unvalidated URLs in data ingestion to perform semi-blind SSRF attacks against internal services.","user_interaction":"not_required","vuln_class":"ssrf"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"opencti","vendor":"citeum"}],"cvss":{"score":7.7,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-918","name":"Server-Side Request Forgery"}],"description":"OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. Prior to 6.8.16, the OpenCTI platform’s data ingestion feature accepts user-supplied URLs without validation and uses the Axios HTTP client with its default configuration (allowAbsoluteUrls: true). This allows attackers to craft requests to arbitrary endpoints, including internal services, because Axios will accept and process absolute URLs. This results in a semi-blind SSRF, as responses may not be fully visible but can still impact internal systems. This vulnerability is fixed in 6.8.16.","ecosystems":["PyPI"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"OpenCTI has a Semi-Blind SSRF via Unvalidated External URL in Data Ingestion Feature","id":"CVE-2026-21887","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"ssrf","year":"2026"},"n_packages":3,"n_references":1,"next":{"headline":"MQTT v5 Variable Byte Integer parsing out-of-bounds: get_var_integer()","id":"CVE-2026-21888"},"packages":[{"ecosystem":"PyPI","fixed":["6.8.16"],"introduced":["0"],"last_affected":[],"package":"pycti","purl":null,"source":"GHSA-ffm6-vvph-g5f5"},{"ecosystem":"PyPI","fixed":["6.8.16"],"introduced":["0"],"last_affected":[],"package":"pycti","purl":"pkg:pypi/pycti","source":"GHSA-ffm6-vvph-g5f5"},{"ecosystem":"PyPI","fixed":["6.8.16"],"introduced":["0"],"last_affected":[],"package":"pycti","purl":"pkg:pypi/pycti","source":"PYSEC-2026-118"}],"prev":{"headline":"OpenCTI's GraphQL Mutations Allow Deletion of Unrelated Entities","id":"CVE-2026-21886"},"products":["opencti"],"published":"2026-03-12","related":[{"cvss_score":9.8,"headline":"OpenCTI privilege escalation and unauthenticated access via default admin account","id":"CVE-2026-27960","kev_date_added":null,"published":"2026-05-05"},{"cvss_score":9.1,"headline":"OpenCTI affected by RCE via notifier template","id":"CVE-2026-39980","kev_date_added":null,"published":"2026-04-09"},{"cvss_score":9.1,"headline":"OpenCTI has remote code execution and sensitive secrets exposed through web hook","id":"CVE-2025-24977","kev_date_added":null,"published":"2025-05-05"},{"cvss_score":8.3,"headline":"OpenCTI Authenticated Privilege Escalation","id":"CVE-2024-26139","kev_date_added":null,"published":"2024-05-23"},{"cvss_score":8.1,"headline":"OpenCTI's lack of Rate Limit lead to OTP brute forcing","id":"CVE-2024-45404","kev_date_added":null,"published":"2024-12-11"},{"cvss_score":7.6,"headline":"OpenCTI vulnerable to Denial of Service through web hook","id":"CVE-2025-26621","kev_date_added":null,"published":"2025-05-19"}],"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":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-03-12","vendors":["OpenCTI-Platform"]},"summary":"Attackers can exploit unvalidated URLs in data ingestion to perform semi-blind SSRF attacks against internal services.","url":"https://insights.sbomify.com/CVE-2026-21887/"}