CVE-2026-73492
Description
A flaw was found in Loofah, a library used for processing HTML and XML documents. The 'allowed_uri?' function, intended to validate Uniform Resource Identifiers (URIs), does not correctly identify and reject 'javascript:' or 'vbscript:' URIs when their scheme is obscured by specific HTML-encoded numeric character references. This oversight allows a browser to decode and execute the manipulated URI, potentially leading to arbitrary code execution. This issue specifically impacts applications that directly provide HTML-encoded strings to the 'allowed_uri?' function.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 3.7 | N/A | N/A |
| Attack Vector | Network | N/A | N/A |
| Attack Complexity | High | N/A | N/A |
| Privileges Required | Low | N/A | N/A |
| User Interaction | Required | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | Low | N/A | N/A |
| Integrity Impact | Low | N/A | N/A |
| Availability Impact | None | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N
Understanding the Weakness (CWE)
Other
Technical Impact: Other
Frequently Asked Questions
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