{"id":"GHSA-fhrf-q333-82fm","summary":"CI4MS: Blogs Categories Full Account Takeover for All-Roles & Privilege-Escalation via Stored DOM XSS","details":"## Summary\n### **Vulnerability: Stored DOM XSS via Blog Category Title (Persistent Payload Injection)**\n- Stored Cross-Site Scripting via Unsanitized Blog Category Title in Blog Management\n\n### Description\nThe application fails to properly sanitize user-controlled input when creating or editing blog categories. An attacker can inject a malicious JavaScript payload into the category title field, which is then stored server-side.\n\nThis stored payload is later rendered unsafely across public-facing blog category pages, administrative interfaces, and blog post views without proper output encoding, leading to stored cross-site scripting (XSS).\n\n### Affected Functionality\n- Blog category creation functionality\n- Blog category editing functionality\n- Blog category storage and retrieval logic\n\n### Attack Scenario\n- An attacker creates or edits a blog category title to include a malicious XSS payload.\n- The application stores this value without sanitization or encoding.\n- The payload persists and executes whenever the category title is rendered in affected views.\n\n### Impact\n- Persistent Stored XSS\n- Execution of arbitrary JavaScript in victims’ browsers\n- Privilege escalation when viewed by administrators or privileged users\n- Full administrator account takeover\n- Full account takeover across all roles\n- Full compromise of the entire application\n\nEndpoints:\n- `/backend/blogs/categories/`\n- `/blog/{id}`\n\n## Steps To Reproduce (POC)\n1. Go to the Blog Categories management page\n2. Create or edit a category and insert an XSS payload into the category title such as:\n`\u003cimg src=x onerror=alert(document.domain)\u003e`\n3. Save the category\n4. View a public blog category page, blog post page, or the administrative interface\n5. Notice the XSS payload executing automatically\n\n## Remediation\n\n- **Avoid unsafe DOM manipulation methods:** Do not use `.html()`, `innerHTML`, or similar sink functions in client-side JavaScript or server-side templating (e.g., PHP). Even when user input flowing into these sinks is not immediately apparent, they can introduce Cross-Site Scripting (XSS) vulnerabilities that an attacker may exploit.\n\n- **Apply output encoding:** Implement HTML entity encoding on all user-controlled data before rendering it in the browser. This helps neutralize potentially malicious input.\n\n- **Implement input sanitization:** Ensure that all user-supplied input is properly sanitized before processing or output. Currently, no sanitization mechanisms are in place, which should be addressed as a priority.\n\n- **Enforce security headers and cookie attributes:**\n  - **Content Security Policy (CSP):** Define and enforce a strict CSP to limit the execution of unauthorized scripts.\n  - **HttpOnly flag:** Set the `HttpOnly` attribute on session cookies to prevent client-side script access.\n  - **SameSite attribute:** Configure the `SameSite` cookie attribute to mitigate Cross-Site Request Forgery (CSRF) risks.\n  - **Secure flag:** Ensure all cookies are transmitted only over HTTPS by enabling the `Secure` attribute.\n\n  These measures collectively reduce the impact of XSS and help prevent escalation paths such as CSRF via XSS.\n\n# Ready Video POC:\nhttps://mega.nz/file/GAFC3AJY#3LHyuyl7I7921UEeA-JlUYdckh6zGLCTy-6w9BNzSmQ","aliases":["CVE-2026-34569"],"modified":"2026-04-06T17:36:26.942764Z","published":"2026-04-01T22:07:37Z","database_specific":{"nvd_published_at":"2026-04-01T22:16:20Z","cwe_ids":["CWE-79"],"severity":"CRITICAL","github_reviewed":true,"github_reviewed_at":"2026-04-01T22:07:37Z"},"references":[{"type":"WEB","url":"https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-fhrf-q333-82fm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34569"},{"type":"PACKAGE","url":"https://github.com/ci4-cms-erp/ci4ms"},{"type":"WEB","url":"https://github.com/ci4-cms-erp/ci4ms/releases/tag/0.31.0.0"}],"affected":[{"package":{"name":"ci4-cms-erp/ci4ms","ecosystem":"Packagist","purl":"pkg:composer/ci4-cms-erp/ci4ms"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.31.0.0"}]}],"versions":["0.21.0","0.21.1","0.21.2","0.21.3","0.21.3.1","0.21.3.2","0.21.3.3","0.21.3.4","0.21.3.5","0.21.3.6","0.21.3.7","0.23.0.0","0.23.0.1","0.23.0.2","0.23.1.0","0.24.0.0","0.24.0.16","0.24.0.18","0.24.0.19","0.24.0.20","0.24.0.27","0.24.0.42","0.24.0.45","0.24.0.60","0.25.0.0","0.25.0.1","0.25.0.2","0.25.0.30","0.25.0.39","0.25.0.43","0.25.1.0","0.25.2.0","0.25.3.0","0.26.0.0","0.26.1.0","0.26.2.0","0.26.3.0","0.26.3.1","0.26.3.2","0.26.3.3","0.26.3.4","0.27.0.0","0.28.0.0","0.28.3.0","0.28.4.0","0.28.5.0","0.28.6.0"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-fhrf-q333-82fm/GHSA-fhrf-q333-82fm.json","last_known_affected_version_range":"\u003c= 0.28.6.0"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"}]}