The filter in the tag manager required extra sanitizing to prevent a reflected XSS risk. This affects 3.9 to 3.9.1 3.8 to 3.8.4 3.7 to 3.7.7 3.5 to 3.5.13 and earlier unsupported versions. Fixed in 3.9.2 3.8.5 3.7.8 and 3.5.14.