{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-67276 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-67276 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-67276 is a critical authentication bypass vulnerability in Mikrotik Routeros, published on 5 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-67276 and fix it if it is affected.\n\nWhat it is: CVE-2026-67276 is a critical authentication bypass vulnerability in Mikrotik Routeros, published on 5 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-67276 in the wild and no public exploit code.\n\nAffected product: Mikrotik Routeros. 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-2026-67276/ (Markdown: https://insights.sbomify.com/CVE-2026-67276/index.md)","id":"CVE-2026-67276","markdown":"https://insights.sbomify.com/CVE-2026-67276/index.md","name":"CVE-2026-67276","record":{"aliases":["GHSA-j9wg-77fw-f22f"],"analysis":{"component_type":"network_device","fix_type":"upgrade","impacts":["privilege_escalation","code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Mikrotik RouterOS","requires_auth":"none","summary":"Attackers can impersonate SSH users by forging signatures using a modified RSA key, bypassing authentication to execute commands as the target user.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"CERT-PL","cpe":[{"product":"routeros","vendor":"mikrotik"}],"cvss":{"score":9.2,"severity":"critical","source":"cna","vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-347","name":"Improper Verification of Cryptographic Signature"}],"description":"RouterOS does not compare the complete RSA public key when matching an SSH authentication request to an authorized user key, checking the key type and modulus but omitting the exponent. Because signature verification uses the client-supplied key, an attacker knowing an authorized RSA modulus can supply a key with exponent one, forge a valid signature, and open an SSH command channel as the target user without the private key.This issue affects only 7.x branch was fixed in versions: 7.23.4 (Long-term) and 7.24.2 (Stable)","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":"2026-09-06","github_poc":4,"max_poc_stars":102,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-09-06T12:10:51Z","kind":"github_poc","ref":"https://github.com/dinosn/mikrotrick-poc","stars":102,"title":"CVE-2026-67276 RouterOS SSH public-key authentication bypass lab PoC"},{"date":"2026-09-07T06:56:34Z","kind":"github_poc","ref":"https://github.com/BlackHatExploitation/exploit-mikrotik-2026","stars":14,"title":"CVE-2026-67276 MikroTik RouterOS SSH Authentication Bypass Exploit"},{"date":"2026-09-09T12:22:54Z","kind":"github_poc","ref":"https://github.com/4rt-Net/Mikrotrick_POC","stars":2,"title":"Testing tool for the Mikrotrick exploit (CVE-2026-67276)"},{"date":"2026-09-06T11:52:37Z","kind":"github_poc","ref":"https://github.com/HORKimhab/CVE-2026-67276","stars":1,"title":"CVE-2026-67276 - Draft or TODO"}],"tier":"poc_unverified"},"has_fix":null,"headline":"SSH user impersonation possible in Mikrotik RouterOS","id":"CVE-2026-67276","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"mikrotik:routeros","products":["mikrotik:routeros"],"type":"auth_bypass","year":"2026"},"n_packages":0,"n_references":6,"next":{"headline":"MikroTik RouterOS Missing Authentication for Critical Function","id":"CVE-2026-67277"},"packages":[],"prev":{"headline":"Other in PowerProtect One","id":"CVE-2026-67275"},"products":["RouterOS"],"published":"2026-09-05","related":[{"cvss_score":9.8,"headline":"MikroTik RouterOS Stack-Based Buffer Overflow","id":"CVE-2018-7445","kev_date_added":"2022-09-08","published":"2018-03-19"},{"cvss_score":9.2,"headline":"MikroTik RouterOS Improper Neutralization of Argument Delimiters in a Command","id":"CVE-2026-86060","kev_date_added":"2026-09-10","published":"2026-09-05"},{"cvss_score":9.1,"headline":"MikroTik Router OS Directory Traversal","id":"CVE-2018-14847","kev_date_added":"2021-12-01","published":"2018-08-02"},{"cvss_score":8.8,"headline":"MikroTik RouterOS Missing Authentication for Critical Function","id":"CVE-2026-67277","kev_date_added":"2026-09-10","published":"2026-09-05"},{"cvss_score":6.9,"headline":"Mikrotik RouterOS Improper Enforcement of Behavioral Workflow","id":"CVE-2026-67279","kev_date_added":"2026-09-25","published":"2026-09-05"},{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2017-20149","kev_date_added":null,"published":"2022-10-15"},{"cvss_score":9.8,"headline":"Path traversal in n/a","id":"CVE-2022-34960","kev_date_added":null,"published":"2022-08-25"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-09-09","vendors":["Mikrotik"]},"summary":"Attackers can impersonate SSH users by forging signatures using a modified RSA key, bypassing authentication to execute commands as the target user.","url":"https://insights.sbomify.com/CVE-2026-67276/"}