Signed up for Klaviyo? Dozens of advertisers may have seen your password
Newly revealed security research found that until recently, marketing tech giant Klaviyo was inadvertently sharing the sign-up information of its new customers, including their passwords, with outside advertisers. Sam Jadali, a security researcher and co-founder of cybersecurity startup Melurna, told TechCrunch that the web form on Klaviyo’s sign-up page was misconfigured between at least February 2024 through November 2025, though likely longer. The startup’s tests found that anyone who signed up to Klaviyo using the misconfigured form may have had their sign-up information shared with any of the third-party tech giants and advertisers whose trackers are also embedded on the company’s website.
- ▪Newly revealed security research found that until recently, marketing tech giant Klaviyo was inadvertently sharing the sign-up information of its new customers, including their passwords, with outside advertisers.
- ▪Sam Jadali, a security researcher and co-founder of cybersecurity startup Melurna, told TechCrunch that the web form on Klaviyo’s sign-up page was misconfigured between at least February 2024 through November 2025, though likely longer.
- ▪The startup’s tests found that anyone who signed up to Klaviyo using the misconfigured form may have had their sign-up information shared with any of the third-party tech giants and advertisers whose trackers are also embedded on the compan
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Story provenance
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Record
| Original publisher | TechCrunch |
| Canonical URL | https://techcrunch.com/2026/08/10/signed-up-for-klaviyo-dozens-of-advertisers-may-have-seen-your-password/ |
| Publication time | Mon, 10 Aug 2026 14:14:43 +0000 |
| Retrieval time | 2026-08-10T14:15:47.864Z |
| Last seen | 2026-08-10T14:15:47.864Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | FerITx-ArPeJ · 1 stories |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
Newly revealed security research found that until recently, marketing tech giant Klaviyo was inadvertently sharing the sign-up information of its new customers, including their passwords, with outside advertisers. Sam Jadali, a security researcher and co-founder of cybersecurity startup Melurna, told TechCrunch that the web form on Klaviyo’s sign-up page was misconfigured between at least February 2024 through November 2025, though likely longer. The startup’s tests found that anyone who signed up to Klaviyo using the misconfigured form may have had their sign-up information shared with any of the third-party tech giants and advertisers whose trackers are also embedded on the company’s website.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at TechCrunch.
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