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CWE-83: Improper Neutralization of Script in Attributes in a Web Page
Weakness Summary
The product does not neutralize or incorrectly neutralizes "javascript:" or other URIs from dangerous attributes within tags, such as onmouseover, onload, onerror, or style.
- Canonical source: MITRE CWE-83 (opens in a new tab)
- Published Atomicorp CVE observations: 5
- Distinct affected products in those observations: 5
- Active Atomicorp rules associated with this weakness: 26
Atomicorp Research Context
Atomicorp has published CVE-specific research observations associated with this weakness category. Each linked CVE page states whether the tested request was detected or blocked and is the authoritative customer-facing finding.
The CVEs and rules shown here are selected published examples, not a complete list of Atomicorp protections. If a CWE, CVE, or rule is absent from this page, no conclusion should be drawn about whether Atomicorp protects against that weakness or attack method.
A CWE describes a class of software weakness. It does not identify one exploit request, and association with a CWE does not mean that every vulnerability or exploitation path in that category is detected or blocked.
Selected Published CVE Observations
| CVE | Vulnerability | Product | Atomicorp finding | Observed rules |
|---|---|---|---|---|
| CVE-2026-45118 | MyBB: Contact page reflected XSS | mybb | Protected by Atomicorp rules | 333140 , 333141 , 340003 , 340087 , 340095 , 340099 , 340147 , 340148 , 340158 , 341099 , 341266 , 342259 , 346755 , 350147 , 350148 |
| CVE-2025-11682 | Stored Cross-Site Scripting in Perx Customer Engagement & Loyalty Platform | Customer Engagement & Loyalty Platform | Protected by Atomicorp rules | 333140 , 333141 , 340095 , 340147 , 340148 , 341256 , 342259 , 346755 , 350147 , 350148 |
| CVE-2026-8245 | Concrete CMS 9.5.0 and below is vulnerable to Reflected XSS in Legacy Pagination via HTML attribute injection | concrete cms | Protected by Atomicorp rules | 333140 , 333141 , 340087 , 340095 , 340099 , 340147 , 340148 , 341099 , 341256 , 341266 , 342259 , 346755 , 350147 , 350148 |
| CVE-2026-58391 | OPNsense: Stored XSS in Firewall Rules/NAT pages via a HTML-attribute breakout | core | Protected by Atomicorp rules | 340014 , 340023 , 340029 , 344360 , 344361 , 344363 , 344364 , 344366 , 344370 , 393655 |
| CVE-2026-59727 | Astro: Cross-site scripting via unescaped transition:* directive values on hydrated islands | astro | Protected by Atomicorp rules | 333140 , 333141 , 340095 , 340147 , 340148 , 341256 , 342259 , 346755 , 350147 , 350148 |
Associated Atomicorp WAF Rules
| Rule | Status | Behavior |
|---|---|---|
| 333140 | Active | disruptive (deny) |
| 333141 | Active | disruptive (deny) |
| 340003 | Active | disruptive (deny) |
| 340014 | Active | disruptive (deny) |
| 340023 | Active | disruptive (deny) |
| 340029 | Active | disruptive (deny) |
| 340087 | Active | disruptive (deny) |
| 340095 | Active | disruptive (deny) |
| 340099 | Active | disruptive (deny) |
| 340147 | Active | disruptive (deny) |
| 340148 | Active | disruptive (deny) |
| 340158 | Active | disruptive (deny) |
| 341099 | Active | disruptive (deny) |
| 341256 | Active | disruptive (deny) |
| 341266 | Active | disruptive (deny) |
| 342259 | Active | disruptive (deny) |
| 344360 | Active | disruptive (deny) |
| 344361 | Active | disruptive (deny) |
| 344363 | Active | disruptive (deny) |
| 344364 | Active | disruptive (deny) |
| 344366 | Active | disruptive (deny) |
| 344370 | Active | disruptive (deny) |
| 346755 | Active | disruptive (deny) |
| 350147 | Active | disruptive (deny) |
| 350148 | Active | disruptive (deny) |
| 393655 | Active | disruptive (deny) |
Related MITRE CAPEC Context
MITRE associates this CWE with the following attack-pattern entries. These taxonomy relationships are context, not Atomicorp coverage claims:
CAPEC-243 (opens in a new tab) , CAPEC-244 (opens in a new tab) , CAPEC-588 (opens in a new tab)