{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4637 exists.","fix":"No fix has been published for CVE-2026-4637 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-4637 is a medium-severity cross-site scripting vulnerability in Paessler GmbH PRTG Network Monitor, published on 24 Sep 2026. 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-2026-4637 and fix it if it is affected.\n\nWhat it is: CVE-2026-4637 is a medium-severity cross-site scripting vulnerability in Paessler GmbH PRTG Network Monitor, published on 24 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4637 exists.\n\nAffected product: Paessler GmbH PRTG Network Monitor. 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-2026-4637/ (Markdown: https://insights.sbomify.com/CVE-2026-4637/index.md)","id":"CVE-2026-4637","markdown":"https://insights.sbomify.com/CVE-2026-4637/index.md","name":"CVE-2026-4637","record":{"aliases":["GHSA-xp6x-3pcm-f3ph"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["account_takeover","data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Network monitoring software","requires_auth":"none","summary":"An attacker can execute arbitrary JavaScript via a crafted URL, stealing session cookies and hijacking user accounts in PRTG Network Monitor.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"SEC-VLab","cpe":[],"cvss":{"score":5.1,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","version":"4.0"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"Paessler PRTG Network Monitor before version 26.2.120.1449 is affected by a reflected Cross-Site Scripting (XSS) vulnerability. When a request is made for a non-existent resource ending in \\\".htm\\\", the web interface returns an HTTP 403 \\\"Forbidden Path\\\" error page that echoes the requested URL path into the HTML response body without proper output encoding or sanitization.\n\nAn unauthenticated, remote attacker can craft a URL containing an HTML/JavaScript payload in the path (e.g. https:////welcome.htm) and, once a victim with an active PRTG session opens the crafted link, execute arbitrary JavaScript in the security context of the PRTG web interface. Because the PRTG session cookie is not protected with the HttpOnly attribute, successful exploitation allows the attacker to read and exfiltrate the victim's session cookie, potentially leading to session hijacking.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":null,"headline":"Reflected Cross-Site Scripting via URL Path in Paessler PRTG Network Monitor","id":"CVE-2026-4637","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"xss","year":"2026"},"n_packages":0,"n_references":4,"next":{"headline":"Plaintext Password Disclosure via VBScript Sensor Error Message in Paessler PRTG Network Monitor","id":"CVE-2026-4638"},"packages":[],"prev":{"headline":"Keycloak: keycloak: uma policy bypass allows authenticated users to gain unauthorized access to victim-owned resources.","id":"CVE-2026-4636"},"products":["PRTG Network Monitor"],"published":"2026-09-24","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":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-24","vendors":["Paessler GmbH"]},"summary":"An attacker can execute arbitrary JavaScript via a crafted URL, stealing session cookies and hijacking user accounts in PRTG Network Monitor.","url":"https://insights.sbomify.com/CVE-2026-4637/"}