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| Vulnerability ID | VCID-8k68-7fmz-duhz |
| Aliases |
GHSA-qvc2-mg72-jjhx
|
| Summary | JustHTML Affected by Mutation XSS via Literal Text Serialization in Raw Text Elements (style/script) ## Summary Sanitized DOM trees can be unsafe to serialize when a custom policy allows raw-text elements such as `<style>` or `<script>`. The issue affects DOM trees that are constructed or modified programmatically and then passed through `sanitize_dom()` with a policy that keeps these elements. Text nodes inside `<style>` and `<script>` are serialized literally, so attacker-controlled text containing the matching closing tag sequence can break out of the raw-text context and inject HTML into the serialized output. The default sanitization policy is not affected because it drops the contents of `style` and `script`. ## Details The root cause is in HTML serialization of raw-text elements. In serialize.py, text children of `script` and `style` are emitted verbatim: ```python _LITERAL_TEXT_SERIALIZATION_ELEMENTS = frozenset({"script", "style"}) def _serialize_text_for_parent(text: str | None, parent_name: str | None) -> str: if not text: return "" if parent_name in _LITERAL_TEXT_SERIALIZATION_ELEMENTS: return text return _escape_text(text) |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 6.2 |
| Risk | 3.1 |
| Affected and Fixed Packages | Package Details |
| System | Score | Found at |
|---|---|---|
| cvssv3.1_qr | MODERATE | https://github.com/advisories/GHSA-qvc2-mg72-jjhx |
| cvssv4 | 5.3 | https://github.com/EmilStenstrom/justhtml |
| generic_textual | MODERATE | https://github.com/EmilStenstrom/justhtml |
| cvssv3.1_qr | MODERATE | https://github.com/EmilStenstrom/justhtml/security/advisories/GHSA-qvc2-mg72-jjhx |
| cvssv4 | 5.3 | https://github.com/EmilStenstrom/justhtml/security/advisories/GHSA-qvc2-mg72-jjhx |
| generic_textual | MODERATE | https://github.com/EmilStenstrom/justhtml/security/advisories/GHSA-qvc2-mg72-jjhx |
| Reference id | Reference type | URL |
|---|---|---|
| https://github.com/EmilStenstrom/justhtml | ||
| https://github.com/EmilStenstrom/justhtml/security/advisories/GHSA-qvc2-mg72-jjhx | ||
| GHSA-qvc2-mg72-jjhx | https://github.com/advisories/GHSA-qvc2-mg72-jjhx |
| Attack Vector (AV) | Attack Complexity (AC) | Attack Requirements (AT) | Privileges Required (PR) | User Interaction (UI) | Vulnerable System Impact Confidentiality (VC) | Vulnerable System Impact Integrity (VI) | Vulnerable System Impact Availability (VA) | Subsequent System Impact Confidentiality (SC) | Subsequent System Impact Integrity (SI) | Subsequent System Impact Availability (SA) |
|---|---|---|---|---|---|---|---|---|---|---|
network adjacent local physical |
low high |
none present |
none low high |
none passive active |
high low none |
high low none |
high low none |
high low none |
high low none |
high low none |
| Attack Vector (AV) | Attack Complexity (AC) | Attack Requirements (AT) | Privileges Required (PR) | User Interaction (UI) | Vulnerable System Impact Confidentiality (VC) | Vulnerable System Impact Integrity (VI) | Vulnerable System Impact Availability (VA) | Subsequent System Impact Confidentiality (SC) | Subsequent System Impact Integrity (SI) | Subsequent System Impact Availability (SA) |
|---|---|---|---|---|---|---|---|---|---|---|
network adjacent local physical |
low high |
none present |
none low high |
none passive active |
high low none |
high low none |
high low none |
high low none |
high low none |
high low none |
No EPSS data available for this vulnerability.
| Date | Actor | Action | Source | VulnerableCode Version |
|---|---|---|---|---|
| 2026-06-12T07:49:48.597260+00:00 | GithubOSV Importer | Import | https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-qvc2-mg72-jjhx/GHSA-qvc2-mg72-jjhx.json | 38.6.0 |