An issue was discovered in the fp_newsletter (aka Newsletter subscriber management) extension before 1.1.1, 1.2.0, 2.x before 2.1.2, 2.2.1 through 2.4.0, and 3.x before 3.2.6 for TYPO3. There is a CAPTCHA bypass that can lead to subscribing many people.
{
"versions": [
{
"introduced": "0"
},
{
"fixed": "1.1.1"
},
{
"introduced": "2.0.0"
},
{
"fixed": "2.1.2"
},
{
"introduced": "3.0.0"
},
{
"fixed": "3.2.6"
}
]
}