Cross-site scripting vulnerability in calendar.php in ExtCalendar 1.0 and possibly other versions before 2.0 allows remote attackers to inject arbitrary web script or HTML via the (1) year, (2) month, (3) next, and (4) prev parameters.
CVSS Severity (version 2.0):
Impact Subscore: 2.9
Exploitability Subscore: 10.0
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows unauthorized modification
This issue is reportedly addressed in ExtCalendar 2.0. Symantec has not confirmed this fix. Affected users are advised to contact the vendor for further information.
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20060319 ExtCalendar v1.0 Multiple Xss Vuln
Vulnerable software and versions