Opera before 12.01 on Windows and UNIX, and before 11.66 and 12.x before 12.01 on Mac OS X, ignores some characters in HTML documents in unspecified circumstances, which makes it easier for remote attackers to conduct cross-site scripting (XSS) attacks via a crafted document.
CVE-2012-4142 is a security vulnerability that . Impacting 4 products from opera, from linux, from microsoft and 1 other, organizations running these solutions should prioritize assessment and patching.
Documented in 2012, this vulnerability occurred amid the cloud computing expansion era, where traditional network perimeter security models were being reevaluated. Organizations were transitioning from isolated infrastructure to interconnected systems, creating new attack surfaces that vulnerabilities like this could exploit.
2012-08-06T16:55:06.977
2025-04-11T00:51:21.963
Deferred
CVSSv2: 4.3 (MEDIUM)
AV:N/AC:M/Au:N/C:N/I:P/A:N
8.6
2.9
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | opera | opera_browser | ≤ 12.00 | Yes |
| Application | opera | opera_browser | 12.00 | Yes |
| Operating System | linux | linux_kernel | * | No |
| Operating System | microsoft | windows | * | No |
| Application | opera | opera_browser | ≤ 11.65 | Yes |
| Application | opera | opera_browser | 10.00 | Yes |
| Application | opera | opera_browser | 10.00 | Yes |
| Application | opera | opera_browser | 10.00 | Yes |
| Application | opera | opera_browser | 10.00 | Yes |
| Application | opera | opera_browser | 10.01 | Yes |
| Application | opera | opera_browser | 10.10 | Yes |
| Application | opera | opera_browser | 10.10 | Yes |
| Application | opera | opera_browser | 10.11 | Yes |
| Application | opera | opera_browser | 10.50 | Yes |
| Application | opera | opera_browser | 10.50 | Yes |
| Application | opera | opera_browser | 10.50 | Yes |
| Application | opera | opera_browser | 10.51 | Yes |
| Application | opera | opera_browser | 10.52 | Yes |
| Application | opera | opera_browser | 10.52 | Yes |
| Application | opera | opera_browser | 10.52 | Yes |
| Application | opera | opera_browser | 10.53 | Yes |
| Application | opera | opera_browser | 10.53 | Yes |
| Application | opera | opera_browser | 10.53 | Yes |
| Application | opera | opera_browser | 10.54 | Yes |
| Application | opera | opera_browser | 10.60 | Yes |
| Application | opera | opera_browser | 10.60 | Yes |
| Application | opera | opera_browser | 10.61 | Yes |
| Application | opera | opera_browser | 10.62 | Yes |
| Application | opera | opera_browser | 10.63 | Yes |
| Application | opera | opera_browser | 11.00 | Yes |
| Application | opera | opera_browser | 11.00 | Yes |
| Application | opera | opera_browser | 11.01 | Yes |
| Application | opera | opera_browser | 11.10 | Yes |
| Application | opera | opera_browser | 11.10 | Yes |
| Application | opera | opera_browser | 11.11 | Yes |
| Application | opera | opera_browser | 11.50 | Yes |
| Application | opera | opera_browser | 11.50 | Yes |
| Application | opera | opera_browser | 11.51 | Yes |
| Application | opera | opera_browser | 11.52 | Yes |
| Application | opera | opera_browser | 11.52.1100 | Yes |
| Application | opera | opera_browser | 11.60 | Yes |
| Application | opera | opera_browser | 11.60 | Yes |
| Application | opera | opera_browser | 11.61 | Yes |
| Application | opera | opera_browser | 11.62 | Yes |
| Application | opera | opera_browser | 11.64 | Yes |
| Application | opera | opera_browser | 12.00 | Yes |
| Application | opera | opera_browser | 12.00 | Yes |
| Operating System | apple | mac_os_x | * | No |
SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For opera's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.