{"answers":{"affected":"4 open source packages ship an affected version, including craftcms/cms.","exploited":"There is no known exploitation of CVE-2026-55790 in the wild and no public exploit code.","fix":"Upgrade craftcms/cms to a fixed version for your release line: 4.17.16 or 5.9.23.","what":"CVE-2026-55790 is a high-severity cross-site scripting vulnerability in craftcms cms, published on 1 Jul 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-2026-55790 and fix it if it is affected.\n\nWhat it is: CVE-2026-55790 is a high-severity cross-site scripting vulnerability in craftcms cms, published on 1 Jul 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: There is no known exploitation of CVE-2026-55790 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- craftcms/cms (Packagist): affected from 4.0.0-RC1; fixed in 4.17.16\n- craftcms/cms (Packagist): affected from 4.0.0-RC1; fixed in 4.17.16\n- craftcms/cms (Packagist): affected from 5.0.0-RC1; fixed in 5.9.23\n- craftcms/cms (Packagist): affected from 5.0.0-RC1; fixed in 5.9.23\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-2026-55790/ (Markdown: https://insights.sbomify.com/CVE-2026-55790/index.md)","id":"CVE-2026-55790","markdown":"https://insights.sbomify.com/CVE-2026-55790/index.md","name":"CVE-2026-55790","record":{"aliases":["GHSA-24x4-j6x9-rfw5"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["account_takeover","code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Craft CMS","requires_auth":"none","summary":"An attacker can execute arbitrary JavaScript in a Craft CMS admin's session by poisoning a GitHub issue title viewed in the support widget.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":7.4,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/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":"Craft CMS is a content management system (CMS). In versions 5.0.0-RC1 through 5.9.22 and 4.0.0-RC1 through 4.17.15, an attacker with only a GitHub account can plant a JavaScript payload in a craftcms/cms issue title. When a Craft admin uses the CraftSupport widget’s \"Give feedback\" screen and types a search term that returns the poisoned issue, the payload executes in the admin’s control panel session. No control panel account or elevated privileges are required on the attacker’s side. This issue has been fixed in versions 4.17.16 and 5.9.23.","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":"Craft CMS: DOM XSS via GitHub issue title in CraftSupport widget","id":"CVE-2026-55790","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Packagist","product":null,"products":[],"type":"xss","year":"2026"},"n_packages":4,"n_references":2,"next":{"headline":"Craft CMS: Blind SSRF and Arbitrary JavaScript Injection via Host Header Poisoning in actionResourceJs","id":"CVE-2026-55791"},"packages":[{"ecosystem":"Packagist","fixed":["4.17.16"],"introduced":["4.0.0-RC1"],"last_affected":[],"package":"craftcms/cms","purl":null,"source":"GHSA-24x4-j6x9-rfw5"},{"ecosystem":"Packagist","fixed":["4.17.16"],"introduced":["4.0.0-RC1"],"last_affected":[],"package":"craftcms/cms","purl":"pkg:composer/craftcms/cms","source":"GHSA-24x4-j6x9-rfw5"},{"ecosystem":"Packagist","fixed":["5.9.23"],"introduced":["5.0.0-RC1"],"last_affected":[],"package":"craftcms/cms","purl":null,"source":"GHSA-24x4-j6x9-rfw5"},{"ecosystem":"Packagist","fixed":["5.9.23"],"introduced":["5.0.0-RC1"],"last_affected":[],"package":"craftcms/cms","purl":"pkg:composer/craftcms/cms","source":"GHSA-24x4-j6x9-rfw5"}],"prev":{"headline":"Code injection in logto","id":"CVE-2026-55789"},"products":["cms"],"published":"2026-07-01","related":[],"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":"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":"2026-07-02","vendors":["craftcms"]},"summary":"An attacker can execute arbitrary JavaScript in a Craft CMS admin's session by poisoning a GitHub issue title viewed in the support widget.","url":"https://insights.sbomify.com/CVE-2026-55790/"}