Symantec
CVE-2018-12246
MEDIUM
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK
2 techniques across 2 tactics: Initial Access, Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 6.1 (MEDIUM). Attack characteristics: network attack vector, low complexity, no privileges required, user interaction required. |
| Exploit ScenarioDerived | A remote attacker could inject malicious scripts into web pages viewed by other users by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability. |
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Alert meAnalysisAI
Symantec Web Isolation (WI) 1.11 prior to 1.11.21 is susceptible to a reflected cross-site scripting (XSS) vulnerability. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
RemediationAI
No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.
Affects your stack
Find out whether the stacks and servers you run are on an affected version.
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. Symantec Web Isolation (WI) 1.11 prior to 1.11.21 is susceptible to a reflected cross-site scripting (XSS) vulnerability. A remote attacker can target end users protected by WI with social engineering attacks using crafted URLs for legitimate web sites. A successful attack allows injecting malicious JavaScript code into the website's rendered copy running inside the end user's web browser. It does not allow injecting code into the real (isolated) copy of the website running on the WI Threat Isolation Engine. Affected products include: Symantec Web Isolation. Version information: prior to 1.11.21.
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Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionNVD
Symantec Web Isolation (WI) 1.11 prior to 1.11.21 is susceptible to a reflected cross-site scripting (XSS) vulnerability. A remote attacker can target end users protected by WI with social engineering attacks using crafted URLs for legitimate web sites. A successful attack allows injecting malicious JavaScript code into the website's rendered copy running inside the end user's web browser. It does not allow injecting code into the real (isolated) copy of the website running on the WI Threat Isolation Engine.
Threat Intelligence Overview
NVD
CVE.org
EPSS
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.
Affected Products (CPE)NVD
The Symantec Messaging Gateway before 10.6.3-267 can encounter an issue of remote code execution, which describes a situ
The management GUI in Symantec Web Gateway 5.0.x before 5.0.3 does not properly restrict access to application scripts,
The management console in Symantec Web Gateway 5.0.x before 5.0.3.18 allows remote attackers to execute arbitrary comman
The file-management scripts in the management GUI in Symantec Web Gateway 5.0.x before 5.0.3 allow remote attackers to u
The Symantec Messaging Gateway can encounter an issue of remote code execution, which describes a situation whereby an i
The management console in Symantec Endpoint Protection Manager (SEPM) 11.0 before 11.0.7405.1424 and 12.1 before 12.1.40
The management console in Symantec Endpoint Protection Manager (SEPM) 12.1 before 12.1-RU6-MP1 allows remote attackers t
Integer overflow in the TNEF unpacker in the AntiVirus Decomposer engine in Symantec Advanced Threat Protection (ATP); S
The management console on the Symantec Web Gateway (SWG) appliance before 5.2.2 allows remote authenticated users to exe
The management console in Symantec Endpoint Protection Manager (SEPM) 12.1 before 12.1-RU6-MP1 allows remote authenticat
SQL injection vulnerability in the management console in Symantec Endpoint Protection Manager (SEPM) 11.0 before 11.0.74
The kernel component in Symantec Anti-Virus Engine (AVE) 20151.1 before 20151.1.1.4 allows remote attackers to execute a
GitHub PoC
Exploit-DB