Cache poisoning is a type of cyberattack where hackers manipulate cached content so that users receive harmful or incorrect information instead of the original website content. Web caches are designed to improve speed by storing copies of web pages, images, and other data closer to users.
When a cache is poisoned, the server or content delivery network may start delivering malicious content to many users at once. This makes cache poisoning especially dangerous because a single attack can affect a large number of visitors.
Hackers usually exploit weaknesses in how websites handle headers, URLs, or request parameters. By sending specially crafted requests, attackers may trick the cache into storing fake pages, malicious scripts, or redirects to harmful websites.
For example, an attacker may poison a cached login page with a fake form designed to steal usernames and passwords. Since the poisoned version is stored in the cache, many users may see the fake page without realizing anything is wrong.
Cache poisoning can also be used to spread malware, perform phishing attacks, redirect users to scam websites, or make websites display false information. In some cases, attackers may use it to bypass security protections or damage a company’s reputation.
To reduce the risk, developers should validate all user input, use secure cache settings, avoid caching sensitive pages, and carefully manage headers and query parameters. Regular security testing can also help identify cache-related weaknesses.
As websites continue to rely on caching for speed and performance, cache poisoning remains a major cybersecurity threat because it can manipulate web infrastructure on a very large scale.
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