gijo Flying Scripts Delay JavaScript to Improve Site Speed & Performance Plugin cross site scripting

Summaryinfo

A vulnerability classified as problematic was found in gijo Flying Scripts Delay JavaScript to Improve Site Speed & Performance Plugin up to 1.2.4. The affected element is an unknown function. Such manipulation of the argument Comment leads to cross site scripting. This vulnerability is traded as CVE-2026-109990. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in gijo Flying Scripts Delay JavaScript to Improve Site Speed & Performance Plugin up to 1.2.4. It has been rated as problematic. Affected by this issue is an unknown function. The manipulation of the argument comment with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. CVE summarizes:

The Flying Scripts: Delay JavaScript to Improve Site Speed & Performance plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'comment' parameter in all versions up to, and including, 1.2.4 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The exploit bypasses WordPress core's save-time kses sanitization entirely because the payload uses only kses-allowed elements — an <abbr title> attribute and <code> text content — and the XSS is introduced post-save when the plugin's output-buffer rewriter substitutes a double-quote-bearing <code> body into the <abbr title> attribute via predictable, unsalted ___noise___ placeholder keys.

The advisory is shared for download at wordfence.com. This vulnerability is handled as CVE-2026-109990 since 10/13/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

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

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• WordPress Plugin

Vendor

• gijo

Name

• Flying Scripts Delay JavaScript to Improve Site Speed & Performance Plugin

Version

• 1.2.0
• 1.2.1
• 1.2.2
• 1.2.3
• 1.2.4

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Discussion