CVE-2024-11831 is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in serialize-javascript. A fix is available for serialize-javascript — see the affected versions and patch details below.
Npm-serialize-javascript: cross-site scripting (xss) in serialize-javascript
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2024-11831.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
CVE-2024-11831 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 377,333 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.
serialize-javascriptnpmDescription
A flaw was found in npm-serialize-javascript. The vulnerability occurs because the serialize-javascript module does not properly sanitize certain inputs, such as regex or other JavaScript object types, allowing an attacker to inject malicious code. This code could be executed when deserialized by a web browser, causing Cross-site scripting (XSS) attacks. This issue is critical in environments where serialized data is sent to web clients, potentially compromising the security of the website or web application using this package.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | serialize-javascript | ≥ 6.0.0&&< 6.0.2 | 6.0.2npm install serialize-javascript@6.0.2 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for serialize-javascript, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update serialize-javascript to 6.0.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2024-11831 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2024-11831 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2024-11831. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat Advanced Cluster Security 4.4 | advanced-cluster-security/rhacs-main-rhel8:4.4.8-2 | RHSA-2025:1468 |
| Red Hat Advanced Cluster Security 4.5 | advanced-cluster-security/rhacs-main-rhel8:4.5.6-2 | RHSA-2025:1334 |
| Red Hat Ceph Storage 7.1 | ceph-2:18.2.1-381.el8cp | RHSA-2026:2769 |
| Red Hat Ceph Storage 8.1 | ceph-2:19.2.1-292.el9cp | RHSA-2025:21068 |
| Red Hat Ceph Storage 9.0 | ceph-2:20.1.0-144.el10cp | RHSA-2026:1536 |
| Red Hat Enterprise Linux 8 | dotnet8.0-0:8.0.112-1.el8_10 | RHSA-2025:0381 |
| Red Hat Enterprise Linux 9 | dotnet8.0-0:8.0.112-1.el9_5 | RHBA-2025:0304 |
| RHODF-4.14-RHEL-9 | odf4/ocs-client-console-rhel9:v4.14.18-2 | RHSA-2025:8551 |
Frequently Asked Questions
Is CVE-2024-11831 in your dependencies?
O3 Security finds CVE-2024-11831 across npm dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.