{"answers":{"affected":"6 open source packages ship an affected version, including winter/wn-backend-module. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-27591 in the wild and no public exploit code.","fix":"Upgrade winter/wn-backend-module to a fixed version for your release line: 1.0.477, 1.1.12 or 1.2.12.","what":"CVE-2026-27591 is a critical vulnerability in wintercms winter, published on 11 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-27591 and fix it if it is affected.\n\nWhat it is: CVE-2026-27591 is a critical vulnerability in wintercms winter, published on 11 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-27591 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- winter/wn-backend-module (Packagist): affected all versions; fixed in 1.0.477\n- winter/wn-backend-module (Packagist): affected all versions; fixed in 1.0.477\n- winter/wn-backend-module (Packagist): affected from 1.1.0; fixed in 1.1.12\n- winter/wn-backend-module (Packagist): affected from 1.1.0; fixed in 1.1.12\n- winter/wn-backend-module (Packagist): affected from 1.2.0; fixed in 1.2.12\n- winter/wn-backend-module (Packagist): affected from 1.2.0; fixed in 1.2.12\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-2026-27591/ (Markdown: https://insights.sbomify.com/CVE-2026-27591/index.md)","id":"CVE-2026-27591","markdown":"https://insights.sbomify.com/CVE-2026-27591/index.md","name":"CVE-2026-27591","record":{"aliases":["GHSA-pgpf-m8m4-6cg6"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["privilege_escalation"],"network_reachable":"yes","non_default_config":false,"product_category":"Winter CMS","requires_auth":"low_privilege","summary":"Authenticated backend users can escalate privileges by modifying their own roles and permissions via crafted requests.","user_interaction":"not_required","vuln_class":"privilege_escalation"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"winter","vendor":"wintercms"}],"cvss":{"score":10,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-915","name":"Improperly Controlled Modification of Dynamically-Determined Object Attributes"},{"id":"CWE-639","name":"Authorization Bypass Through User-Controlled Key"},{"id":"CWE-284","name":"Improper Access Control"}],"description":"Winter is a free, open-source content management system (CMS) based on the Laravel PHP framework. Prior to 1.0.477, 1.1.12, and 1.2.12, Winter CMS allowed authenticated backend users to escalate their accounts level of access to the system by modifying the roles / permissions assigned to their account through specially crafted requests to the backend while logged in. To actively exploit this security issue, an attacker would need access to the Backend with a user account with any level of access. This vulnerability is fixed in 1.0.477, 1.1.12, and 1.2.12.","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":"Winter: Privilege escalation by authenticated backend users","id":"CVE-2026-27591","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Packagist","product":null,"products":[],"type":"privilege_escalation","year":"2026"},"n_packages":6,"n_references":4,"next":{"headline":"Statamic is vulnerable to account takeover via password reset link injection","id":"CVE-2026-27593"},"packages":[{"ecosystem":"Packagist","fixed":["1.0.477"],"introduced":["0"],"last_affected":[],"package":"winter/wn-backend-module","purl":null,"source":"GHSA-pgpf-m8m4-6cg6"},{"ecosystem":"Packagist","fixed":["1.0.477"],"introduced":["0"],"last_affected":[],"package":"winter/wn-backend-module","purl":"pkg:composer/winter/wn-backend-module","source":"GHSA-pgpf-m8m4-6cg6"},{"ecosystem":"Packagist","fixed":["1.1.12"],"introduced":["1.1.0"],"last_affected":[],"package":"winter/wn-backend-module","purl":null,"source":"GHSA-pgpf-m8m4-6cg6"},{"ecosystem":"Packagist","fixed":["1.1.12"],"introduced":["1.1.0"],"last_affected":[],"package":"winter/wn-backend-module","purl":"pkg:composer/winter/wn-backend-module","source":"GHSA-pgpf-m8m4-6cg6"},{"ecosystem":"Packagist","fixed":["1.2.12"],"introduced":["1.2.0"],"last_affected":[],"package":"winter/wn-backend-module","purl":null,"source":"GHSA-pgpf-m8m4-6cg6"},{"ecosystem":"Packagist","fixed":["1.2.12"],"introduced":["1.2.0"],"last_affected":[],"package":"winter/wn-backend-module","purl":"pkg:composer/winter/wn-backend-module","source":"GHSA-pgpf-m8m4-6cg6"}],"prev":{"headline":"Caddy: Unicode case-folding length expansion causes incorrect split_path index in FastCGI transport","id":"CVE-2026-27590"},"products":["winter"],"published":"2026-03-11","related":[{"cvss_score":8.5,"headline":"Winter CMS Modules allows a sandbox bypass in Twig templates leading to data modification and deletion","id":"CVE-2024-54149","kev_date_added":null,"published":"2024-12-09"},{"cvss_score":8.1,"headline":"Winter vulnerable to Prototype Pollution in Snowboard framework","id":"CVE-2022-39357","kev_date_added":null,"published":"2022-10-26"},{"cvss_score":7.2,"headline":"Winter CMS Server-Side Template Injection (SSTI) vulnerability","id":"CVE-2024-29686","kev_date_added":null,"published":"2024-03-29"},{"cvss_score":3.3,"headline":"Winter CMS Local File Inclusion through Server Side Template Injection","id":"CVE-2023-52085","kev_date_added":null,"published":"2023-12-29"},{"cvss_score":2,"headline":"Stored XSS through privileged upload of Media Manager file followed by renaming","id":"CVE-2023-52083","kev_date_added":null,"published":"2023-12-28"},{"cvss_score":2,"headline":"Winter CMS Stored XSS through Backend ColorPicker FormWidget","id":"CVE-2023-52084","kev_date_added":null,"published":"2023-12-28"}],"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":"total"},"state":"PUBLISHED","updated":"2026-03-12","vendors":["wintercms"]},"summary":"Authenticated backend users can escalate privileges by modifying their own roles and permissions via crafted requests.","url":"https://insights.sbomify.com/CVE-2026-27591/"}