Flock browser RSS feed cross-site scripting

flock-rss-xss (61820) The risk level is classified as MediumMedium Risk


The Flock browser could allow a remote attacker to bypass cross-domain security restrictions and execute arbitrary script on a victim's system, caused by the improper validation of user-supplied input when processing RSS feeds. By persuading a victim to visit a specially-crafted Web site containing a malicious RSS feed, a remote attacker could bypass same-origin policy restrictions and execute script in the context of another domain. An attacker could exploit this vulnerability to possibly perform cross-site scripting attacks and launch further attacks on the vulnerable system.


Base Score: 4.3
  Access Vector: Network
  Access Complexity: Medium
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: Partial
  Availability Impact: None
Temporal Score: 4.1
  Exploitability: High
  Remediation Level: Unavailable
  Report Confidence: Uncorroborated


Gain Access


Upgrade to the latest version of Flock ( or later), available from the Flock Web site. See References.


  • BugTraq Mailing List, Tue Sep 14 2010: [FLOCK-SA-2010-01] Flock Browser: A malformed favourite can bypass cross origin protection (XSS).
  • Flock Web site: Flock: Overview.
  • BID-43225: Flock RSS Feed Cross Domain Scripting Vulnerability
  • CVE-2010-3262: Cross-site scripting (XSS) vulnerability in Flock Browser 3.x before allows remote attackers to inject arbitrary web script or HTML via a crafted RSS feed.
  • OSVDB ID: 68120: Flock Browser Crafted RSS Feed XSS

Platforms Affected:

  • Flock Flock browser 3.0.0
  • Flock Flock browser


Sep 14, 2010

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