{"id":"CVE-2025-55735","summary":"flaskBlog Stored XSS Vulnerability","details":"flaskBlog is a blog app built with Flask. In 2.8.0 and earlier, when creating a post, there's no validation of the content of the post stored in the variable \"postContent\". The vulnerability arises when displaying the content of the post using the | safe filter, that tells the engine to not escape the rendered content. This can lead to a stored XSS inside the content of the post. The code that causes the problem is in template/routes.html.","aliases":["GHSA-gj9v-qhc3-gcfx"],"modified":"2026-04-10T05:26:19.822499Z","published":"2025-08-19T18:56:42.600Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/55xxx/CVE-2025-55735.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-79","CWE-807"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/55xxx/CVE-2025-55735.json"},{"type":"ADVISORY","url":"https://github.com/DogukanUrker/FlaskBlog/security/advisories/GHSA-gj9v-qhc3-gcfx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-55735"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/dogukanurker/flaskblog","events":[{"introduced":"0"},{"last_affected":"7fea76d8c9ae624125ed86ed63e2c56dfad0d757"}],"database_specific":{"versions":[{"introduced":"0"},{"last_affected":"2.8.0"}]}}],"versions":["1.0.0","1.0.1","1.0.2","1.0.3","1.0.4","1.0.5","1.0.6","1.0.7","1.0.8","1.0.9","1.1.0","2.0.0","2.0.1","2.0.10","2.0.11","2.0.12","2.0.2","2.0.3","2.0.4","2.0.5","2.0.6","2.0.7","2.0.8","2.0.9","2.1.0","2.1.1","2.1.2","2.1.3","2.1.4","2.2.0","2.2.1","2.3.0","2.4.0","2.5.0","2.6.0","2.7.0","2.8.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-55735.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"}]}