{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-2266 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-2266 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-2266 is a high-severity cross-site scripting vulnerability in Github Enterprise Server, published on 10 Mar 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-2026-2266 and fix it if it is affected.\n\nWhat it is: CVE-2026-2266 is a high-severity cross-site scripting vulnerability in Github Enterprise Server, published on 10 Mar 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-2026-2266 in the wild and no public exploit code.\n\nAffected product: Github Enterprise Server. 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-2026-2266/ (Markdown: https://insights.sbomify.com/CVE-2026-2266/index.md)","id":"CVE-2026-2266","markdown":"https://insights.sbomify.com/CVE-2026-2266/index.md","name":"CVE-2026-2266","record":{"aliases":["GHSA-vg33-x66f-82h4"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["code_execution","account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"GitHub Enterprise Server","requires_auth":"low_privilege","summary":"An authenticated attacker can inject arbitrary HTML and execute scripts in other users' browsers via malicious task list items in GitHub Enterprise Server.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_P","cpe":[{"product":"enterprise_server","vendor":"github"}],"cvss":{"score":7.4,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"An improper neutralization of input vulnerability was identified in GitHub Enterprise Server that allowed DOM-based cross-site scripting via task list content. The task list content extraction logic did not properly re-encode browser-decoded text nodes before rendering, allowing user-supplied HTML to be injected into the page. An authenticated attacker could craft malicious task list items in issues or pull requests to execute arbitrary scripts in the context of another user's browser session. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.20 and was fixed in versions 3.18.6 and 3.19.3. This vulnerability was reported via the GitHub Bug Bounty program.","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":"Cross-site scripting in Enterprise Server","id":"CVE-2026-2266","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"github:enterprise_server","products":["github:enterprise_server"],"type":"xss","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"Ninja Forms \u003c= 3.14.0 - Unauthenticated Information Disclosure in nf_ajax_submit AJAX Action","id":"CVE-2026-2268"},"packages":[],"prev":{"headline":"Replicator 1.0.5 is vulnerable to Remote Code Execution through Insecure Deserialization","id":"CVE-2026-2265"},"products":["Enterprise Server"],"published":"2026-03-10","related":[{"cvss_score":10,"headline":"Auth bypass in Enterprise Server","id":"CVE-2024-4985","kev_date_added":null,"published":"2024-05-20"},{"cvss_score":9.8,"headline":"Missing authorization in GitHub Enterprise Server","id":"CVE-2022-23739","kev_date_added":null,"published":"2023-01-17"},{"cvss_score":9.8,"headline":"Improper Limitation of a Pathname to a Restricted Directory in GitHub Enterprise Server leading to RCE","id":"CVE-2022-46255","kev_date_added":null,"published":"2022-12-14"},{"cvss_score":9.8,"headline":"Improper access control in GitHub Enterprise Server allows self-hosted runners to execute outside their control group","id":"CVE-2021-22869","kev_date_added":null,"published":"2021-09-24"},{"cvss_score":9.5,"headline":"Auth bypass in Enterprise Server","id":"CVE-2024-9487","kev_date_added":null,"published":"2024-10-10"},{"cvss_score":9.5,"headline":"Auth bypass in GitHub Enterprise Server","id":"CVE-2024-6800","kev_date_added":null,"published":"2024-08-20"},{"cvss_score":9.3,"headline":"GitHub Enterprise Server notebook viewer vulnerable to Server-side request forgery","id":"CVE-2026-77987","kev_date_added":null,"published":"2026-09-22"}],"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":"total"},"state":"PUBLISHED","updated":"2026-03-11","vendors":["GitHub"]},"summary":"An authenticated attacker can inject arbitrary HTML and execute scripts in other users' browsers via malicious task list items in GitHub Enterprise Server.","url":"https://insights.sbomify.com/CVE-2026-2266/"}