The developers of the popular Jetpack plugin for WordPress have patched a critical vulnerability that allows malicious actors to attack website administrators.
Jetpack, a plugin with more than one million active installs, provides WordPress website administrators tools needed for customization, security, traffic, and performance.
According to Sucuri, Jetpack 3.7 and earlier are plagued by a stored cross-site scripting(XSS) vulnerability that affects the plugin’s contact form module, which is activated by default.
Montpas has pointed out that Jetpack uses some filters and functions to sanitize email addresses and ensure that they are valid. However, experts have managed to bypass the constraints by leveraging various tricks, such as inserting slashes between attributes and replacing semicolons with the equivalent HTML decimal code (;).
Sucuri noted that unlike the less dangerous reflected XSS, which requires the attacker to trick the victim into clicking on a specially crafted link, stored XSS flaws are far more serious since they allow the attacker to insert malicious code into the targeted website and the code gets executed as soon as a user visits the page containing it.
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