{"answers":{"affected":"11 open source packages ship an affected version, including github.com/fleetdm/fleet and github.com/fleetdm/fleet/v4. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-22808 in the wild and no public exploit code.","fix":"Upgrade github.com/fleetdm/fleet to a fixed version for your release line: 4.75.2, 4.76.2, 4.77.1 or 4.78.2.","what":"CVE-2026-22808 is a medium-severity cross-site scripting vulnerability in fleetdm fleet, published on 21 Jan 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-2026-22808 and fix it if it is affected.\n\nWhat it is: CVE-2026-22808 is a medium-severity cross-site scripting vulnerability in fleetdm fleet, published on 21 Jan 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-2026-22808 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/fleetdm/fleet (Go): affected from 4.75.0; fixed in 4.75.2\n- github.com/fleetdm/fleet (Go): affected from 4.75.0; fixed in 4.75.2\n- github.com/fleetdm/fleet (Go): affected from 4.76.0; fixed in 4.76.2\n- github.com/fleetdm/fleet (Go): affected from 4.76.0; fixed in 4.76.2\n- github.com/fleetdm/fleet (Go): affected from 4.77.0; fixed in 4.77.1\n- github.com/fleetdm/fleet (Go): affected from 4.77.0; fixed in 4.77.1\n- github.com/fleetdm/fleet (Go): affected from 4.78.0; fixed in 4.78.2\n- github.com/fleetdm/fleet (Go): affected from 4.78.0; fixed in 4.78.2\n- github.com/fleetdm/fleet/v4 (Go): affected all versions; fixed in 4.43.5-0.20260111020427-0e6c790803d1\n- github.com/fleetdm/fleet/v4 (Go): affected all versions; fixed in 4.43.5-0.20260111020427-0e6c790803d1\n- github.com/fleetdm/fleet/v4 (Go): affected from 4.75.0; fixed in 4.75.2, 4.76.2, 4.77.1, 4.78.2\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-2026-22808/ (Markdown: https://insights.sbomify.com/CVE-2026-22808/index.md)","id":"CVE-2026-22808","markdown":"https://insights.sbomify.com/CVE-2026-22808/index.md","name":"CVE-2026-22808","record":{"aliases":["GHSA-gfpw-jgvr-cw4j","GO-2026-4336"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["account_takeover","data_read","data_modify"],"network_reachable":"yes","non_default_config":true,"product_category":"Fleet device management","requires_auth":"low_privilege","summary":"An unauthenticated attacker can steal admin tokens via XSS in the Windows MDM endpoint, gaining unauthorized access and control over Fleet.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"fleet","vendor":"fleetdm"}],"cvss":{"score":5.5,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H","version":"4.0"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"fleetdm/fleet is open source device management software. Prior to versions 4.78.2, 4.77.1, 4.76.2, 4.75.2, and 4.53.3, if Windows MDM is enabled, an unauthenticated attacker can exploit this XSS vulnerability to steal a Fleet administrator's authentication token (FLEET::auth_token) from localStorage. This could allow unauthorized access to Fleet, including administrative access, visibility into device data, and modification of configuration. Versions 4.78.2, 4.77.1, 4.76.2, 4.75.2, and 4.53.3 fix the issue. If an immediate upgrade is not possible, affected Fleet users should temporarily disable Windows MDM.","ecosystems":["Go"],"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":"Fleet Windows MDM endpoint has a Cross-site Scripting vulnerability","id":"CVE-2026-22808","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"xss","year":"2026"},"n_packages":11,"n_references":1,"next":{"headline":"tarteaucitron.js has Regular Expression Denial of Service (ReDoS) vulnerability","id":"CVE-2026-22809"},"packages":[{"ecosystem":"Go","fixed":["4.75.2"],"introduced":["4.75.0"],"last_affected":[],"package":"github.com/fleetdm/fleet","purl":null,"source":"GHSA-gfpw-jgvr-cw4j"},{"ecosystem":"Go","fixed":["4.75.2"],"introduced":["4.75.0"],"last_affected":[],"package":"github.com/fleetdm/fleet","purl":"pkg:golang/github.com/fleetdm/fleet","source":"GHSA-gfpw-jgvr-cw4j"},{"ecosystem":"Go","fixed":["4.76.2"],"introduced":["4.76.0"],"last_affected":[],"package":"github.com/fleetdm/fleet","purl":null,"source":"GHSA-gfpw-jgvr-cw4j"},{"ecosystem":"Go","fixed":["4.76.2"],"introduced":["4.76.0"],"last_affected":[],"package":"github.com/fleetdm/fleet","purl":"pkg:golang/github.com/fleetdm/fleet","source":"GHSA-gfpw-jgvr-cw4j"},{"ecosystem":"Go","fixed":["4.77.1"],"introduced":["4.77.0"],"last_affected":[],"package":"github.com/fleetdm/fleet","purl":null,"source":"GHSA-gfpw-jgvr-cw4j"},{"ecosystem":"Go","fixed":["4.77.1"],"introduced":["4.77.0"],"last_affected":[],"package":"github.com/fleetdm/fleet","purl":"pkg:golang/github.com/fleetdm/fleet","source":"GHSA-gfpw-jgvr-cw4j"},{"ecosystem":"Go","fixed":["4.78.2"],"introduced":["4.78.0"],"last_affected":[],"package":"github.com/fleetdm/fleet","purl":null,"source":"GHSA-gfpw-jgvr-cw4j"},{"ecosystem":"Go","fixed":["4.78.2"],"introduced":["4.78.0"],"last_affected":[],"package":"github.com/fleetdm/fleet","purl":"pkg:golang/github.com/fleetdm/fleet","source":"GHSA-gfpw-jgvr-cw4j"},{"ecosystem":"Go","fixed":["4.43.5-0.20260111020427-0e6c790803d1"],"introduced":["0"],"last_affected":[],"package":"github.com/fleetdm/fleet/v4","purl":null,"source":"GHSA-gfpw-jgvr-cw4j"},{"ecosystem":"Go","fixed":["4.43.5-0.20260111020427-0e6c790803d1"],"introduced":["0"],"last_affected":[],"package":"github.com/fleetdm/fleet/v4","purl":"pkg:golang/github.com/fleetdm/fleet/v4","source":"GHSA-gfpw-jgvr-cw4j"},{"ecosystem":"Go","fixed":["4.75.2","4.76.2","4.77.1","4.78.2"],"introduced":["4.75.0","4.76.0","4.77.0","4.78.0"],"last_affected":[],"package":"github.com/fleetdm/fleet/v4","purl":"pkg:golang/github.com/fleetdm/fleet/v4","source":"GO-2026-4336"}],"prev":{"headline":"vLLM affected by RCE via auto_map dynamic module loading during model initialization","id":"CVE-2026-22807"},"products":["fleet"],"published":"2026-01-21","related":[{"cvss_score":10,"headline":"SAML authentication vulnerability in Fleet","id":"CVE-2020-26276","kev_date_added":null,"published":"2020-12-17"},{"cvss_score":9.3,"headline":"Fleet before 4.87.0 Authentication Bypass via Device Identifiers","id":"CVE-2026-103264","kev_date_added":null,"published":"2026-10-01"},{"cvss_score":9.3,"headline":"Fleet has a JWT signature bypass vulnerability in Azure AD MDM enrollment","id":"CVE-2026-23518","kev_date_added":null,"published":"2026-01-21"},{"cvss_score":8.7,"headline":"Fleet server may terminate unexpectedly when handling certain gRPC requests","id":"CVE-2026-26062","kev_date_added":null,"published":"2026-05-14"},{"cvss_score":8.7,"headline":"Fleet's unbounded request body read allows remote Denial of Service","id":"CVE-2026-26061","kev_date_added":null,"published":"2026-03-27"},{"cvss_score":8.2,"headline":"Fleet has a Windows MDM management endpoint authentication bypass","id":"CVE-2026-23998","kev_date_added":null,"published":"2026-05-14"},{"cvss_score":8.2,"headline":"Fleet Windows MDM Azure AD JWT Authentication Bypass","id":"CVE-2026-24899","kev_date_added":null,"published":"2026-05-14"}],"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":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"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":"2026-01-22","vendors":["fleetdm"]},"summary":"An unauthenticated attacker can steal admin tokens via XSS in the Windows MDM endpoint, gaining unauthorized access and control over Fleet.","url":"https://insights.sbomify.com/CVE-2026-22808/"}