LiteSpeed Cache Vulnerability (October 2026): Update to 7.9.1 Now

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LiteSpeed Cache is one of the most installed WordPress plugins. It often comes preinstalled on hosts that run LiteSpeed web servers, so plenty of site owners have it without ever having chosen it. That’s exactly why this one is worth five minutes of your time today.

Here’s what was found, how serious it is, and the quickest way to make sure your site is patched.

What is the new LiteSpeed Cache vulnerability?

On October 22, 2026, Patchstack published a sensitive data exposure flaw in LiteSpeed Cache, tracked as CVE-2026-114190 and found by researcher Ananda Dhakal. Every version up to and including 7.9 is affected. The developers fixed it in 7.9.1.

“Sensitive data exposure” means the plugin can reveal information that should stay private. Patchstack hasn’t published the technical details, which is normal while sites are still updating, so we can’t say exactly what data is exposed. Don’t trust anyone who claims to know more right now.

The part that matters most for you: no login is needed. An attacker doesn’t need an account on your site. That’s why it’s worth patching even though the severity score is “medium.”

How serious is it?

A CVSS score of 5.9 puts it in the medium range. It isn’t a “your site gets taken over” bug. But two things push it up the to-do list. It needs no login, so bots can try it against any site. And LiteSpeed Cache runs on millions of sites, which makes it an attractive target once details become public.

Patchstack’s database also lists other recent LiteSpeed Cache issues, including a stored cross-site scripting flaw fixed earlier in 2026 (CVE-2026-3375, versions up to 7.7). If you haven’t updated this plugin in a while, you’re carrying more than one known bug.

How to fix it, step by step

Step 1: Check which version you have

In your WordPress dashboard, go to Plugins → Installed Plugins and find LiteSpeed Cache. The version number sits under the plugin description. If it says 7.9.1 or higher, you’re already patched. Skip to step 4.

Step 2: Back up first (30 seconds)

Updates almost never break anything, but a backup costs nothing. Most hosts, including Hostinger, have a one-click backup in their control panel, or you can use a backup plugin.

Step 3: Update the plugin

Click Update now under LiteSpeed Cache on the Plugins screen, or go to Dashboard → Updates. If you manage the site from the command line, run:

wp plugin update litespeed-cache

Don’t see an update? Click “Check again” on the Updates page. Some hosts lock plugin versions, so ask your host if it still won’t appear.

Step 4: Purge the cache

After updating, open LiteSpeed Cache → Toolbox → Purge and click Purge All. This makes sure visitors get fresh pages built by the new version.

Step 5: Test your site

Open your homepage, a post, and any contact or checkout form in a private browser window. If something looks broken, purge again and clear your browser cache before panicking.

Step 6: Turn on auto-updates for this plugin

On the Plugins screen, click Enable auto-updates next to LiteSpeed Cache. For a widely targeted plugin, automatic security updates do more good than harm.

Do you even need LiteSpeed Cache?

Only if your host runs a LiteSpeed web server. That’s where its page caching works. On Apache or Nginx hosting, most of its best features don’t apply, and a different caching plugin may suit you better. If you aren’t using it at all, deactivating and deleting it removes the risk entirely. An unused plugin is still attack surface.

If you’re on LiteSpeed hosting, keep it.

How to tell if your site was affected

Because this flaw exposes data rather than letting attackers change your site, there may be nothing visible to find. Still, a quick check is sensible:

Look for administrator accounts you don’t recognise under Users. Check your host’s security emails and, if you use one, your security plugin’s activity log. And search Google for site:yourdomain.com to spot spam pages you never published. If anything looks off, change your WordPress, hosting and database passwords and ask your host to scan the account.

Simple habits that prevent the next one

Most WordPress hacks don’t use clever new bugs. They use old bugs on sites that never updated. Turning on auto-updates for plugins you trust, deleting the ones you don’t use, and keeping a recent backup off your server covers the majority of real-world risk.

If you’re running your own server rather than shared hosting, that responsibility is all yours, which is one reason many bloggers stay on managed hosting. Comparing setups? See our cPanel alternatives guide.

Sources

• Patchstack: LiteSpeed Cache <= 7.9 Sensitive Data Exposure (October 22, 2026)
• Patchstack: LiteSpeed Cache vulnerability history
• CVE-2026-3375 (stored XSS, earlier 2026)

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