Plugin vulnerabilities
Is SiteGround Speed Optimizer safe? Known vulnerabilities and the version to run.
Speed Optimizer by SiteGround: siteGround's caching and performance plugin, often preinstalled on sites hosted there.
The short answer
Run SiteGround Speed Optimizer 7.8.5 or later. That version has a fix for every known vulnerability that's been patched.
- Known vulnerabilities
- 5
- In the last 12 months
- 3
- Rated high or critical
- 1
- No fix yet
- 0
Every known SiteGround Speed Optimizer vulnerability
Newest first. The most recent was disclosed on 23 October 2026. Each one links to its full record on Wordfence.
| Vulnerability | Severity | Affected versions | Fixed in |
|---|---|---|---|
| Authenticated (Administrator+) Stored Cross-Site ScriptingCVE-2026-111737 · 23 October 2026 | Medium 4.4 | before 7.8.5 | 7.8.5 |
| Missing AuthorizationCVE-2026-111738 · 23 October 2026 | Low 2.7 | before 7.8.5 | 7.8.5 |
| Authenticated (Contributor+) Stored Cross-Site Scripting via Image Tag AttributesCVE-2026-15421 · 18 August 2026 | Medium 6.4 | 7.8.0 and earlier | 7.8.1 |
| Missing Authorization via purge_on_other_events()CVE-2024-32532 · 15 April 2024 | Medium 5.3 | 7.4.6 and earlier | 7.5.0 |
| Missing AuthorizationCVE-2019-25217 · 14 March 2019 | Critical 9.8 | before 5.0.13 | 5.0.13 |
If you run SiteGround Speed Optimizer
What to do now
- Check your version. In WordPress, go to Plugins and look under SiteGround Speed Optimizer. Compare it with the affected versions above.
- Update to 7.8.5 or later. Take a backup first, then update. If the update breaks something, you can restore the backup while you work out why.
- Check the rest of your site. One outdated plugin is rarely the only one. Our free security check looks at your WordPress version, and the plugins and theme it can see from the outside, for known flaws and emails you a report.
Pressfort keeps your plugins up to date for you, testing each update on a copy of your site first, and its virtual patching blocks attacks on newly disclosed flaws, often before a fix is out. If your site does get hacked, two clean-ups a year are included, with a developer stepping in when needed. See how it works.
Caching and performance
Related plugins
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14 known8 in the last year
WP Fastest Cache
A simple caching plugin for speeding up WordPress.
39 known5 in the last year
WP-Optimize
Cleans the database, compresses images and caches pages to speed a site up.
5 known2 in the last year
Smush
Compresses, resizes and lazy-loads images.
11 known5 in the last year
WP Super Cache
Automattic's page caching plugin, which serves static copies of pages to speed sites up.
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Data sources and licences
Vulnerability data comes from Wordfence Intelligence and is refreshed daily. Severity is the CVSS score given in each record. Pressfort is not affiliated with Wordfence or Defiant Inc.
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