10Web Booster Plugin up to 2.34.10 on WordPress compressCustom page_id unrestricted upload

Summaryinfo

A vulnerability was found in 10Web Booster Plugin up to 2.34.10. It has been rated as critical. Impacted is the function compressCustom. This manipulation of the argument page_id causes unrestricted upload. The identification of this vulnerability is CVE-2026-108587. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in 10Web Booster Plugin up to 2.34.10. It has been declared as critical. Affected by this vulnerability is the function compressCustom. The manipulation of the argument page_id with an unknown input leads to a unrestricted upload vulnerability. The CWE definition for the vulnerability is CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at wordfence.com. This vulnerability is known as CVE-2026-108587 since 10/10/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/15/2026). MITRE ATT&CK project uses the attack technique T1608.002 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• WordPress Plugin

Vendor

• 10Web

Name

• Booster Plugin

Version

• 2.34.0
• 2.34.1
• 2.34.2
• 2.34.3
• 2.34.4
• 2.34.5
• 2.34.6
• 2.34.7
• 2.34.8
• 2.34.9
• 2.34.10

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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