tigroumeow Meow Gallery Plugin up to 5.5.1 on WordPress Attachment Alt Text sanitize_text_field aria-label cross site scripting

Summaryinfo

A vulnerability, which was classified as problematic, has been found in tigroumeow Meow Gallery Plugin up to 5.5.1. Impacted is the function sanitize_text_field of the component Attachment Alt Text. The manipulation of the argument aria-label leads to cross site scripting. This vulnerability is traded as CVE-2026-9239. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in tigroumeow Meow Gallery Plugin up to 5.5.1 and classified as problematic. This issue affects the function sanitize_text_field of the component Attachment Alt Text. The manipulation of the argument aria-label 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. The summary by CVE is:

The Meow Gallery plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Attachment Alt Text (aria-label attribute) in all versions up to, and including, 5.5.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The vulnerable code path is only reachable when a gallery item is rendered as a link (i.e., link_href is non-empty), and exploitation relies on the fact that WordPress's sanitize_text_field() strips angle-bracketed tags but preserves double quotes, allowing an attacker to break out of the aria-label attribute context and inject event-handler attributes such as onclick.

The advisory is shared at wordfence.com. The identification of this vulnerability is CVE-2026-9239 since 05/21/2026. The exploitation is known to be easy. The attack may be initiated remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 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

• tigroumeow

Name

• Meow Gallery Plugin

Version

• 5.5.0
• 5.5.1

CPE 2.3info

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• 🔒

CPE 2.2info

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• 🔒

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Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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