{"answers":{"affected":"2 open source packages ship an affected version, including librenms/librenms. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-26991 in the wild and no public exploit code.","fix":"Upgrade librenms/librenms to 26.2.0 or later.","what":"CVE-2026-26991 is a medium-severity cross-site scripting vulnerability in Librenms Librenms, published on 20 Feb 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-26991 and fix it if it is affected.\n\nWhat it is: CVE-2026-26991 is a medium-severity cross-site scripting vulnerability in Librenms Librenms, published on 20 Feb 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-26991 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- librenms/librenms (Packagist): affected all versions; fixed in 26.2.0\n- librenms/librenms (Packagist): affected all versions; fixed in 26.2.0\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-2026-26991/ (Markdown: https://insights.sbomify.com/CVE-2026-26991/index.md)","id":"CVE-2026-26991","markdown":"https://insights.sbomify.com/CVE-2026-26991/index.md","name":"CVE-2026-26991","record":{"aliases":["GHSA-5pqf-54qp-32wx"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["code_execution","account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"Network monitoring tool","requires_auth":"low_privilege","summary":"Attackers with admin privileges can inject malicious scripts via unsanitized device group names, leading to stored XSS attacks in LibreNMS.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"librenms","vendor":"librenms"}],"cvss":{"score":5.1,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/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":"LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. In versions 26.1.1 and below, the device group name is not sanitized, allowing attackers with admin privileges to perform Stored Cross-Site Scripting (XSS) attacks. When a user adds a device group, an HTTP POST request is sent to the Request-URI \"/device-groups\". The name of the newly created device group is stored in the value of the name parameter. After the device group is created, the entry is displayed along with relevant buttons such as Rediscover Devices, Edit, and Delete. This issue has been fixed in version 26.2.0.","ecosystems":["Packagist"],"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":"LibreNMS vulnerable to Stored Cross-site Scripting through unsanitized /device-groups name","id":"CVE-2026-26991","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Packagist","product":"librenms:librenms","products":["librenms:librenms"],"type":"xss","year":"2026"},"n_packages":2,"n_references":4,"next":{"headline":"LibreNMS has Stored Cross-Site Scripting via unsanitized /port-groups name","id":"CVE-2026-26992"},"packages":[{"ecosystem":"Packagist","fixed":["26.2.0"],"introduced":["0"],"last_affected":[],"package":"librenms/librenms","purl":null,"source":"GHSA-5pqf-54qp-32wx"},{"ecosystem":"Packagist","fixed":["26.2.0"],"introduced":["0"],"last_affected":[],"package":"librenms/librenms","purl":"pkg:composer/librenms/librenms","source":"GHSA-5pqf-54qp-32wx"}],"prev":{"headline":"LibreNMS has Time-Based Blind SQL Injection in address-search.inc.php","id":"CVE-2026-26990"},"products":["librenms"],"published":"2026-02-20","related":[{"cvss_score":9.8,"headline":"Cross-site Scripting (XSS) - Stored in librenms/librenms","id":"CVE-2023-4982","kev_date_added":null,"published":"2023-09-15"},{"cvss_score":9.8,"headline":"Command injection in librenms","id":"CVE-2022-29712","kev_date_added":null,"published":"2022-05-31"},{"cvss_score":9.8,"headline":"Path traversal in librenms/librenms","id":"CVE-2021-44278","kev_date_added":null,"published":"2021-12-03"},{"cvss_score":9.8,"headline":"LibreNMS Information Disclosure","id":"CVE-2019-10665","kev_date_added":null,"published":"2019-09-09"},{"cvss_score":9.8,"headline":"LibreNMS arbitrary OS commands execution","id":"CVE-2018-20434","kev_date_added":null,"published":"2019-04-24"},{"cvss_score":9.3,"headline":"LibreNMS: SQL Injection in ajax_table.php spreads through a covert data stream","id":"CVE-2026-26988","kev_date_added":null,"published":"2026-02-20"},{"cvss_score":9.2,"headline":"LibreNMS before 26.8.0 Authentication Bypass via API Token Type Confusion","id":"CVE-2026-86426","kev_date_added":null,"published":"2026-09-07"}],"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":"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":"2026-02-20","vendors":["librenms"]},"summary":"Attackers with admin privileges can inject malicious scripts via unsanitized device group names, leading to stored XSS attacks in LibreNMS.","url":"https://insights.sbomify.com/CVE-2026-26991/"}