Dropping support for lower version of TLS | Zoho Campaigns
Hello,
The Zoho Campaigns team is here with an important security update. Keeping your data safe is something we take seriously, and as part of our ongoing efforts to strengthen platform security, Zoho Campaigns will stop supporting older browsers and API clients that rely on weak security protocols (known as weak TLS cipher suites).
To check if your setup is affected, simply visit https://tlstest.zoho.com/api. When you open the link, you'll get a short message. If it indicates you have a "Strong cipher", you're good; if it says "Weak cipher", it's time to update.
What does this mean for you?
If you're using a modern, up-to-date browser (such as the latest versions of Chrome, Firefox, Safari, or ChatGPT Atlas) or an API client, you're already good to go; no action is needed.
However, if you or your end users are still using older browsers or API clients, access to Zoho Campaigns could be interrupted once this change takes effect. The fix is simple: Upgrade to the latest version of your browser or API client.
When does this take effect?
This change will come into effect across all Zoho Campaigns data centers on June 30, 2026.
What are API clients?
API clients are tools or applications that interact with Zoho Campaigns programmatically; for example, tools like Postman, custom scripts, or third-party integrations that connect to Zoho Campaigns via APIs. If you're using any such tools, please ensure they're updated to their latest versions.
What is TLS, and why does it matter?
TLS is the technology that creates a secure, encrypted connection between your browser or app and the websites and services you use. Think of it as the lock on a digital door. Over time, some older lock designs have become easier for attackers to break. This update means Zoho Campaigns will only accept connections through newer, stronger locks in order to keep your data—and your contacts' data—better protected.
What's changing under the hood?
For those who'd like to understand the specifics, after June 30, 2026, only the following strong TLS cipher suites will be supported:
TLS 1.2
- TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
- TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
- TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256
- TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
- TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
- TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
TLS 1.3
- TLS_AES_256_GCM_SHA384
- TLS_CHACHA20_POLY1305_SHA256
- TLS_AES_128_GCM_SHA256
For the full technical background on this change and what it means across Zoho services, head over to our detailed blog post.
Partners: Help us pass this along
Please ensure your customers and end users are informed about this change. If anyone encounters access issues after June 30, 2026, please keep in mind the resolution in most cases is as simple as upgrading to a modern browser or API client.
If you have any questions or need assistance, please reach out to our support team at support@zohocampaigns.com. We're here to help.
Kind regards,
The Zoho Campaigns Team
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