Semrush published an official statement on October 27, 2026 admitting to an industry-wide problem with poisoned search results pages and advising its own paying customers to compare unexpected ranking changes against Google Search Console. The disclosure, titled Poisoned SERPs: An Update on Google Ranking Data in Semrush, confirmed what rank-tracking providers had been hinting at for weeks.
Poisoned results pages are search results pages that Google returns to automated rank trackers with altered or swapped content, rather than the results a human searcher would see. The reported target of the poisoning is unauthorised AI grounding scrapers, but third-party SEO analytics tools that scrape Google results have been caught in the same net.
The effect is that tracker data can show ranking drops, gains, or absences that do not reflect what real searchers see. For agencies reporting to clients, that is a serious data-quality problem: the dashboard may be confidently wrong, and the error looks exactly like a ranking change.
Semrush's statement acknowledged the industry-wide poisoning crisis and advised customers to verify unexpected ranking changes against first-party Google Search Console data. That advice is notable because it comes from a vendor telling its own paying users to trust another source more than its product for the moment.
The statement followed weeks of disclosures across the tracking industry. AccuRanker disclosed that Google tightened its poisoning detection again on October 15, 20, and 23, poisoning about 40 percent of its first desktop fetches on October 24. Ahrefs confirmed 5 to 20 percent poisoned results and began rewriting historical data.
Google has made no public statement on the poisoning, according to reporting on the disclosures. The silence leaves the industry guessing about scope, duration, and whether the practice will expand, and it means vendors are disclosing unilaterally rather than coordinating around an official explanation.
For SEOs, the absence of an official statement is itself information. When a data source degrades without explanation, the prudent response is to downgrade confidence in that source and triangulate, rather than to assume the next report will be clean.
First, treat any sudden tracker movement as unverified until Search Console confirms it. Search Console is first-party data from Google itself, and it does not depend on scraping results pages, so it is not exposed to the same poisoning.
Second, annotate client reports. A note saying tracker data is affected by a known industry-wide issue, with Search Console as the check, protects both the agency and the client from decisions made on bad data. Third, avoid drastic SEO changes based on tracker-only evidence during this period.
The poisoning episode accelerates a shift already underway: scraped rank data is becoming less reliable as a single source of truth, while first-party data from Search Console, analytics, and AI citation tracking grows more important. Tools that combine multiple sources will age better than tools that depend on one scrape.
For link builders, the lesson is similar. Rankings reported by any single tool are an estimate, not a fact. Anchor reporting in traffic, conversions, and links earned, which are observable outcomes, rather than in tracker positions alone.
Clients do not need a technical lecture on result-page poisoning, but they do need honesty about what changed and why. A good client note says three things: tracker data is currently affected by a known industry-wide issue, Search Console is the check being used instead, and no site changes will be made on tracker evidence alone until the data is confirmed.
That note protects the agency-client relationship twice. It prevents a panicked reaction to a false drop, and it demonstrates that the agency understands its own tools' limits. Clients forgive a tool problem far more easily than they forgive a confident report that turns out to have been wrong.
Sources: Semrush official statement, October 27, 2026, as reported October 28, 2026.
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