PHP inclusions, SQL injections, directory traversals, crossite scripting, information leaks, etc.
WordPress Peter’s Custom Anti-Spam Image: CAPTCHA protection bypass.
vulners.com/securityvulns/securityvulns:doc:18358
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vulners.com/securityvulns/securityvulns:doc:18361
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vulners.com/securityvulns/securityvulns:doc:18364
vulners.com/securityvulns/securityvulns:doc:18366