CVE-2026-108587
The 10Web Booster – Website speed optimization, Cache & Page Speed optimizer plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.34.10 via the compressCustom function.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.92%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
The 10Web Booster – Website speed optimization, Cache & Page Speed optimizer plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.34.10 via the compressCustom function. This is due to missing file type validation and extension filtering on the page_id parameter, combined with a world-readable leaked nonce that bypasses authentication checks. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. This exploit chain requires obtaining the plugin's REST nonce (tenwebio_rest), which is automatically serialized to a world-readable file under wp-content/uploads/ whenever a bulk optimisation batch pauses; because the nonce is generated in a cron/loopback context with a user ID of 0, it is valid for unauthenticated visitors.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.92% probability · 60th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-434
- Source
- security@wordfence.com
EPSS moved from 0.9% on 15 October 2026 to 0.9% on 26 October 2026.
References
- https://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.1/vendor/10web-utils/10web-queue/src/TenWebQueue/Traits/QueueRestart.php#L63
- https://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.1/vendor/10web-utils/tenweb-image-optimizer/src/TenWebIO/CompressService.php#L99
- https://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.1/vendor/10web-utils/tenweb-image-optimizer/src/TenWebIO/Rest.php#L310
- https://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.1/vendor/10web-utils/tenweb-image-optimizer/src/TenWebIO/Rest.php#L99
- https://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.1/vendor/10web-utils/tenweb-image-optimizer/src/TenWebIO/Utils.php#L161
- https://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.5/vendor/10web-utils/10web-queue/src/TenWebQueue/Traits/QueueRestart.php#L63
- https://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.5/vendor/10web-utils/tenweb-image-optimizer/src/TenWebIO/CompressService.php#L99
- https://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.5/vendor/10web-utils/tenweb-image-optimizer/src/TenWebIO/Rest.php#L310
- https://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.5/vendor/10web-utils/tenweb-image-optimizer/src/TenWebIO/Rest.php#L99
- https://plugins.trac.wordpress.org/browser/tenweb-speed-optimizer/tags/2.34.5/vendor/10web-utils/tenweb-image-optimizer/src/TenWebIO/Utils.php#L161
- https://plugins.trac.wordpress.org/changeset/3743299/tenweb-speed-optimizer
- https://www.wordfence.com/threat-intel/vulnerabilities/id/adfd97cf-8f61-463d-a535-1a61e3c2e134?source=cve
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.