{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2023-51540 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2023-51540 yet. Limit exposure of the affected software until one is available.","what":"CVE-2023-51540 is a high-severity cross-site scripting vulnerability in Kunal Nagar Custom 404 Pro, published on 1 Feb 2024. 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-2023-51540 and fix it if it is affected.\n\nWhat it is: CVE-2023-51540 is a high-severity cross-site scripting vulnerability in Kunal Nagar Custom 404 Pro, published on 1 Feb 2024. 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-2023-51540 in the wild and no public exploit code.\n\nAffected product: Kunal Nagar Custom 404 Pro. 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-2023-51540/ (Markdown: https://insights.sbomify.com/CVE-2023-51540/index.md)","id":"CVE-2023-51540","markdown":"https://insights.sbomify.com/CVE-2023-51540/index.md","name":"CVE-2023-51540","record":{"aliases":["GHSA-77pp-vwgv-x2jq"],"analysis":{"component_type":"cms_plugin","fix_type":"upgrade","impacts":["code_execution","account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"WordPress plugin","requires_auth":"none","summary":"Stored XSS in Custom 404 Pro allows attackers to inject malicious scripts, potentially leading to session hijacking or site defacement.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Patchstack","cpe":[{"product":"custom_404_pro","vendor":"kunalnagar"}],"cvss":{"score":7.1,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L","version":"3.1"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Kunal Nagar Custom 404 Pro allows Stored XSS.This issue affects Custom 404 Pro: from n/a through 3.10.0.","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":"WordPress Custom 404 Pro Plugin \u003c= 3.10.0 is vulnerable to Cross Site Scripting (XSS)","id":"CVE-2023-51540","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"xss","year":"2023"},"n_packages":0,"n_references":1,"next":{"headline":"WordPress Stock Ticker Plugin \u003c= 3.23.4 is vulnerable to Cross Site Scripting (XSS)","id":"CVE-2023-51541"},"packages":[],"prev":{"headline":"WordPress Apollo13 Framework Extensions Plugin \u003c= 1.9.1 is vulnerable to Cross Site Request Forgery (CSRF)","id":"CVE-2023-51539"},"products":["Custom 404 Pro"],"published":"2024-02-01","related":[{"cvss_score":9.8,"headline":"Custom 404 Pro \u003c 3.8.1 - Multiple SQL Injection","id":"CVE-2023-2032","kev_date_added":null,"published":"2023-06-27"},{"cvss_score":8.3,"headline":"WordPress Custom 404 Pro Plugin \u003c= 3.7.0 is vulnerable to SQL Injection (SQLi)","id":"CVE-2022-47605","kev_date_added":null,"published":"2023-04-12"},{"cvss_score":7.1,"headline":"WordPress Custom 404 Pro plugin \u003c= 3.11.1 - Reflected Cross Site Scripting (XSS) vulnerability","id":"CVE-2024-39646","kev_date_added":null,"published":"2024-08-01"},{"cvss_score":6.1,"headline":"Custom 404 Pro \u003c 3.7.3 - Reflected Cross-Site Scripting","id":"CVE-2023-2023","kev_date_added":null,"published":"2023-05-30"},{"cvss_score":6.1,"headline":"Cross-site scripting in n/a","id":"CVE-2019-15838","kev_date_added":null,"published":"2019-08-30"},{"cvss_score":6.1,"headline":"Cross-site scripting in n/a","id":"CVE-2019-14789","kev_date_added":null,"published":"2019-08-15"}],"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)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-04-28","vendors":["Kunal Nagar"]},"summary":"Stored XSS in Custom 404 Pro allows attackers to inject malicious scripts, potentially leading to session hijacking or site defacement.","url":"https://insights.sbomify.com/CVE-2023-51540/"}