{"answers":{"affected":"It affects 2 products.","exploited":"Yes. Attackers have exploited CVE-2023-27351 in the wild since at least 20 Apr 2026, including in ransomware campaigns.","fix":"No fix has been published for CVE-2023-27351 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 4 May 2026.","what":"CVE-2023-27351 is a high-severity authentication bypass vulnerability in PaperCut NG, published on 20 Apr 2023. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2023-27351 and fix it if it is affected.\n\nWhat it is: CVE-2023-27351 is a high-severity authentication bypass vulnerability in PaperCut NG, published on 20 Apr 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: Yes. Attackers have exploited CVE-2023-27351 in the wild since at least 20 Apr 2026, including in ransomware campaigns.\n\nAffected product: PaperCut NG. 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-2023-27351/ (Markdown: https://insights.sbomify.com/CVE-2023-27351/index.md)","id":"CVE-2023-27351","markdown":"https://insights.sbomify.com/CVE-2023-27351/index.md","name":"CVE-2023-27351","record":{"aliases":["GHSA-2c69-r2jh-xjvm"],"analysis":{"component_type":"web_application","fix_type":"patch","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"PaperCut NG","requires_auth":"none","summary":"Remote attackers can bypass authentication in PaperCut NG due to a flaw in the SecurityRequestFilter, allowing unauthorized system access.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"zdi","cpe":[{"product":"papercut_mf","vendor":"papercut"},{"product":"papercut_ng","vendor":"papercut"}],"cvss":{"score":8.2,"severity":"high","source":"cna","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","version":"3.0"},"cwes":[{"id":"CWE-287","name":"Improper Authentication"}],"description":"This vulnerability allows remote attackers to bypass authentication on affected installations of PaperCut NG 22.0.5 (Build 63914). Authentication is not required to exploit this vulnerability. The specific flaw exists within the SecurityRequestFilter class. The issue results from improper implementation of the authentication algorithm. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-19226.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":1,"refs":[{"date":null,"kind":"nuclei","ref":"http/cves/2023/CVE-2023-27351.yaml","stars":null,"title":"PaperCut NG - Authentication Bypass"}],"tier":"exploited"},"has_fix":null,"headline":"PaperCut NG/MF Improper Authentication","id":"CVE-2023-27351","indexable":true,"kev":{"dateAdded":"2026-04-20","dueDate":"2026-05-04","knownRansomwareCampaignUse":"Known","product":"NG/MF","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","vendorProject":"PaperCut","vulnerabilityName":"PaperCut NG/MF Improper Authentication Vulnerability"},"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"auth_bypass","year":"2023"},"n_packages":0,"n_references":2,"next":{"headline":"Use after free in One Speaker","id":"CVE-2023-27352"},"packages":[],"prev":{"headline":"PaperCut MF/NG Improper Access Control","id":"CVE-2023-27350"},"products":["NG"],"published":"2023-04-20","related":[{"cvss_score":9.8,"headline":"PaperCut MF/NG Improper Access Control","id":"CVE-2023-27350","kev_date_added":"2023-04-21","published":"2023-04-20"},{"cvss_score":9.4,"headline":"PaperCut NG/MF Unsafe Reflection","id":"CVE-2026-82078","kev_date_added":"2026-08-31","published":"2026-08-28"},{"cvss_score":8.8,"headline":"PaperCut NG/MF Missing Authentication for Critical Function","id":"CVE-2026-81578","kev_date_added":"2026-08-31","published":"2026-08-28"},{"cvss_score":8.4,"headline":"PaperCut NG/MF Cross-Site Request Forgery (CSRF)","id":"CVE-2023-2533","kev_date_added":"2025-07-28","published":"2023-06-20"},{"cvss_score":9.8,"headline":"Path traversal in n/a","id":"CVE-2023-39143","kev_date_added":null,"published":"2023-08-04"},{"cvss_score":9.8,"headline":"Code injection in n/a","id":"CVE-2019-12135","kev_date_added":null,"published":"2019-06-06"}],"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":"open","licence":"CC0 1.0","name":"CISA KEV"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"attribution","licence":"MIT","name":"Nuclei templates"}],"ssvc":{"automatable":"yes","exploitation":"active","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-10-01","vendors":["PaperCut"]},"summary":"Remote attackers can bypass authentication in PaperCut NG due to a flaw in the SecurityRequestFilter, allowing unauthorized system access.","url":"https://insights.sbomify.com/CVE-2023-27351/"}