Have you ever opened your rank tracking report on a morning, seen your website drop out of the top 10, felt your heart beat fast, and hurriedly prepared for an emergency meeting with your boss – only for everything to return to normal a few days later as if nothing ever happened? If so, you are not alone. And more importantly, chances are that ranking never actually dropped.
Over the past few months, a strange phenomenon has quietly spread across the global SEO community: rank tracking tools receive search engine result pages that look completely normal, but the content inside has been altered. No errors, no CAPTCHAs, no warnings. Just false results returned as if they were real.
And recently, Semrush officially confirmed that this phenomenon is real, affects the data collected by SEO tools, and could cause advertisers to make decisions based on misleading information.
Join me, SilverZ, as we dissect this story from its roots. Because if you are relying on rank trackers to evaluate SEO performance, this is what you need to know before taking action.
What are "Poisoned SERPs" and why are they dangerous?
Imagine receiving a newspaper that looks completely normal: correct paper size, correct font, correct layout. But upon closer reading, you discover that the headlines have been swapped, and the content has been replaced with unrelated articles. The newspaper still "looks real", but the information inside is fake.
That is precisely what is happening with poisoned SERPs – the term the SEO community uses to describe Google search result pages that have been "poisoned".
According to Semrush, there are two main types of poisoned SERPs:
- Clearly irrelevant results: The result page contains content that completely fails to match the search query, sometimes even at the top of the page. These cases are easier to spot because the discrepancy is too obvious.
- Results that look correct but contain loose content: The initial result page looks normal, but as you scroll down, you discover results that are only vaguely related to the query. This type is much more dangerous because it is difficult to detect by both humans and automated systems.
Semrush provided a specific example: a query in Brazil searching for a specific baby stroller model returned equipment pages from a dental supply store instead. The reason? Both products share the word "carrinho" in Portuguese – a linguistic coincidence leading to a completely incorrect result.
What makes poisoned SERPs dangerous is that: there are no warning signs whatsoever. The page still loads normally, still has all 10 results, still features ads and special features. No HTTP errors, no CAPTCHAs, no notifications from Google. Rank tracking tools save it to their database as if it were real data. And just like that, a website can "disappear" from the top 10 overnight – while real users still see it in its normal position.
Semrush Confirmation: Scale and Impact
On October 27, 2026, Semrush officially spoke out. They acknowledged that their systems have been receiving inaccurate results from Google since late summer, and this is an issue affecting the entire industry, not just Semrush.
It is worth noting that Semrush stated the impact on their users is "limited". The reason: their team has added verification steps to detect and filter out clearly invalid results, while adjusting data sources and continuously updating checks as Google changes its behavior. Semrush also noted that most affected results appear on deeper pages, not the first page – where most users and advertisers focus their tracking.
But not every provider has had the same experience. Nozzle – a company that published in-depth research on this issue – analyzed 27.5 million SERPs across 49 countries and found that 8.0% of pages crawled since September 13 were poisoned, compared to just 0.17% previously. On affected pages, only 20.7% of websites that previously held a position were still present, compared to a normal rate of 88.5%. And the tracked project's own website disappeared from the top 10 on 58.6% of poisoned pages, compared to only 2.7% during the baseline period.
Nozzle also recorded that Reddit and Facebook occupied more top 10 positions on poisoned pages, and legal-related queries were hit the hardest, peaking at 51.3% on September 27.
It is not just Semrush and Nozzle. Ahrefs stated that 5% to 20% of search results are affected, depending on the data provider. SEOmonitor reported about 8% of daily results are inaccurate or incomplete. DemandSphere flagged 6.7% of crawled SERPs as suspected of being poisoned on October 23. SISTRIX confirmed receiving results that differed from expected rankings and disabled its on-demand update feature back in September.
Why would Google do this?
This is a question no one has a definitive answer to, not even Semrush. Google has not made any public statements about whether it intentionally returns false results to rank tracking tools.
However, analysts offer a plausible hypothesis: Google is stepping up its fight against scraping – the automated collection of data from search results. Nozzle describes Google as deploying a three-pronged campaign:
- Widespread IP blocking: Google blocks IP ranges of major residential proxy networks – where rank trackers typically route their requests to look like normal traffic.
- Increasing CAPTCHA frequency: Google uses CAPTCHAs significantly more often when it suspects a request comes from a machine.
- Data injection: This is the newest and most concerning attack vector. Instead of rejecting a request – which would prompt the tool to retry – Google returns a completed page with fake results, and the tool saves it as real data.
Barry Schwartz, who first reported on this issue, noted that Google's target is not SEO tools, but rather AI bots and large-scale scraping services. However, rank tracking tools – which also rely on scraping – are affected as an unintended "side effect".
What does this mean for Vietnamese SEOers and advertisers?
You might be thinking: "I use a Vietnamese tool, or I check manually, so I should be fine."
Do not be complacent. The issue is not the tool you use, but the data source. Any tool that collects Google results using automated methods – whether international or domestic – is at risk of receiving poisoned data. And if you rely on that data to decide to increase budgets, change content, or even fire an SEO strategy, you might be making decisions based on a distorted picture.
Here are actions you should take right now:
1. Cross-reference with Google Search Console
This is the most official and reliable source of data on what Google actually records. When a tool reports an abnormal drop in rankings, check impressions, clicks, and average position in Search Console before panicking. If Search Console does not show a corresponding decline, it is likely poisoned data, not a real ranking drop.
2. Use multiple data sources
Never bet on a single tool. Combine rank trackers with analytics data, Search Console, and manual checks on key queries. Discrepancies between sources are warning signs that you are looking at untrustworthy data.
3. Look for patterns, not single events
Poisoned SERPs often create spikes in anomalies that then disappear on their own. Track trends over several days or weeks before altering your strategy. A single-day rank drop is not worth changing everything over.
4. Pause automated decisions based on rankings
If you are using automated tools to adjust bids, allocate budgets, or trigger alerts based on ranking changes, pause until you verify the signals with independent data. Do not let a temporary data glitch lead to costly decisions.
5. Document and report
If you find clear evidence of a poisoned result for a specific query or market, document the query, time, and screenshots, and contact your tool provider. Semrush has asked customers to send relevant domains and keywords so they can re-verify the data.
When data is no longer absolute truth
I have been doing SEO for two decades, and I have witnessed this industry fall into chaos more than once. From major algorithm updates that turn everything upside down, to changes in how Google displays results, to the rise of AI and the new challenges it brings. Each time, SEO professionals must learn to adapt, and those who fail to adapt get left behind.
However, the poisoned SERPs story carries a different meaning this time. It is not just about a new algorithm or a new feature. It is about the nature of the data we rely on to make decisions. For years, we assumed that if a tool reported a number, that number was correct. We built workflows, reports, and even business strategies based on that assumption.
And now, that assumption is being tested. Not because our tools are bad, but because the underlying data source is changing its behavior. Google is actively making it harder for those trying to collect its data, and SEO tools – whether they want it or not – are caught in the crossfire.
The biggest lesson here is not "do not trust rank trackers". The lesson is: build a multi-layered measurement system, and always verify before taking action. Data is a tool, not the absolute truth. And in a world where even the most seemingly objective numbers can be "poisoned", the ability to have informed skepticism is a survival skill for professional SEOs.
Google may be "playing" with scraping tools. But the real game is this: who among us is level-headed enough not to be swept up in false numbers, and patient enough to verify before changing strategy?
Have you ever witnessed an "impossible" ranking drop on a tracking tool, only for everything to return to normal a few days later without you lifting a finger? If so, how did you react – and knowing that it might just be "poisoned" data, how will you change the way you check rankings? Share your story or perspective below, because in an era where data can be distorted, everyone's experience is a piece of the puzzle that makes the SEO community stronger!
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