CVE-2026-5388
- Source
- https://cve.org/CVERecord?id=CVE-2026-5388
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-5388.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-5388
- Aliases
- Published
- 2026-08-23T13:34:09.169Z
- Modified
- 2026-08-25T04:03:22.240919715Z
- Severity
-
- 9.3 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- justhtml before 1.15.0 Multiple Security Issues
- Details
-
justhtml before 1.15.0 contains multiple security issues in URL sanitization helpers (cleanurlvalue/cleanurlinjsstring), HTML serialization, Markdown passthrough (htmlpassthrough=True), and several custom sanitization-policy edge cases. Depending on configuration, an attacker can bypass sanitization to inject active HTML and JavaScript — for example via encoded javascript: URLs, backslash-based relative URLs resolved as remote hosts, markup-breaking programmatic element/attribute names or HTML comments, raw </textarea> reintroduction through Markdown passthrough, or preserved <style>/<meta http-equiv=refresh>/<base href> tags in custom policies. Most custom-policy issues do not affect the default sanitize=True configuration; they primarily affect helper APIs, programmatic DOM construction, htmlpassthrough=True, and custom policies/transform pipelines.
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5388.json", "cwe_ids": [ "CWE-20" ], "cna_assigner": "VulnCheck" }- References