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Mozilla Foundation Security Advisory 2010-84

Title: XSS hazard in multiple character encodings
Impact: Moderate
Announced: December 9, 2010
Reporter: Yosuke Hasegawa, Masatoshi Kimura
Products: Firefox, SeaMonkey

Fixed in: Firefox 3.6.13
  Firefox 3.5.16
  SeaMonkey 2.0.11


Security researchers Yosuke Hasegawa and Masatoshi Kimura reported that the x-mac-arabic, x-mac-farsi and x-mac-hebrew character encodings are vulnerable to XSS attacks due to some characters being converted to angle brackets when displayed by the rendering engine. Sites using these character encodings would thus be potentially vulnerable to script injection attacks if their script filtering code fails to strip out these specific characters.