Smush – Image Optimization, Compression, Lazy Load, WebP & CDN: known security problems
9 known security problems reported for this WordPress plugin, with the affected versions, the fix and what to do.
Updated
In short
There are 9 known security problems on this page. Each one has a fixed version. Updating to version 4.3.4 or newer covers every fixed problem listed here.
Based on public reports. Check the plugin’s changelog. Watchfox AI may be wrong.
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Someone could do things on your site they should not be allowed to (up to and including 4.3.3)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.3.3
- Fixed in
- 4.3.4
- What to do
- If your site has an affected version, update Smush – Image Optimization, Compression, Lazy Load, WebP & CDN to version 4.3.4 or newer.
- Official ID
- CVE-2026-110039
- Report title
- Smush <= 4.3.3 - Missing Authorization
- First reported
- Sources
- Wordfence, seen
Someone who already has an admin account could run their own code on your site and take it over
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Before 4.3.2
- Fixed in
- 4.3.2
- What to do
- If your site has an affected version, update Smush – Image Optimization, Compression, Lazy Load, WebP & CDN to version 4.3.2 or newer.
- Official ID
- CVE-2026-19223
- Report title
- Smush – Image Optimization, Compression, Lazy Load, WebP & CDN < 4.3.2 - Authenticated (Administrator+) Remote Code Execution
- First reported
- Sources
- Wordfence, seen
A stranger could slow down or crash your site
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.2.0
- Fixed in
- 4.3.0
- What to do
- If your site has an affected version, update Smush – Image Optimization, Compression, Lazy Load, WebP & CDN to version 4.3.0 or newer.
- Official ID
- CVE-2026-81285
- Report title
- Smush – Image Optimization, Compression, Lazy Load, WebP & CDN <= 4.2.0 - Unauthenticated Denial of Service
- First reported
- Sources
- Wordfence, seen
Someone could use it to harm your site (up to and including 3.17.0)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 3.17.0
- Fixed in
- 3.17.1
- What to do
- If your site has an affected version, update Smush – Image Optimization, Compression, Lazy Load, WebP & CDN to version 3.17.1 or newer.
- Official ID
- CVE-2025-22288
- Report title
- Smush Image Compression and Optimization <= 3.17.0 - Authenticated (Admin+) Directory Traversal
- First reported
- Sources
- Wordfence, seen
Someone could do things on your site they should not be allowed to (up to and including 3.16.4)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 3.16.4
- Fixed in
- 3.16.5
- What to do
- If your site has an affected version, update Smush – Image Optimization, Compression, Lazy Load, WebP & CDN to version 3.16.5 or newer.
- Official ID
- CVE-2023-3352
- Report title
- Smush – Lazy Load Images, Optimize & Compress Images <= 3.16.4 - Missing Authorization to Resmush List Deletion
- First reported
- Sources
- Wordfence, seen
Someone could plant harmful code that runs for your visitors or admins (up to and including 3.9.8)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 3.9.8
- Fixed in
- 3.9.9
- What to do
- If your site has an affected version, update Smush – Image Optimization, Compression, Lazy Load, WebP & CDN to version 3.9.9 or newer.
- Official ID
- CVE-2022-1009
- Report title
- Smush – Lazy Load Images, Optimize & Compress Images <= 3.9.8 - Cross-Site Scripting
- First reported
- Sources
- Wordfence, seen
Someone could use it to harm your site (up to and including 3.0.0)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 3.0.0
- Fixed in
- 3.0.1
- What to do
- If your site has an affected version, update Smush – Image Optimization, Compression, Lazy Load, WebP & CDN to version 3.0.1 or newer.
- Report title
- Smush – Lazy Load Images, Optimize & Compress Images <= 3.0.0 - Authenticated PHAR Deserialization
- First reported
- Sources
- Wordfence, seen
Someone could plant harmful code that runs for your visitors or admins (up to and including 2.9.1)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 2.9.1
- Fixed in
- 3.0.0
- What to do
- If your site has an affected version, update Smush – Image Optimization, Compression, Lazy Load, WebP & CDN to version 3.0.0 or newer.
- Report title
- Smush – Lazy Load Images, Optimize & Compress Images <= 2.9.1 - Cross-Site Scripting
- First reported
- Sources
- Wordfence, seen
Someone could use it to harm your site (up to and including 2.7.5)
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 2.7.5
- Fixed in
- 2.7.6
- What to do
- If your site has an affected version, update Smush – Image Optimization, Compression, Lazy Load, WebP & CDN to version 2.7.6 or newer.
- Official ID
- CVE-2017-15079
- Report title
- Smush – Lazy Load Images, Optimize & Compress Images <= 2.7.5 - Directory Traversal
- First reported
- Sources
- Wordfence, seen
Where this comes from
We collect these reports from public security sources and rewrite them in plain words. Each problem shows its sources and the date we first saw it. This page never says whether your own site is affected: only a check of your site’s versions can tell.
Get an email when your site is affected.
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