CVE-2026-107756 tigroumeow CVE debrief

Who should care

Defenders responsible for WordPress installations with the Meow Lightbox plugin should assess exposure and verify the presence of vulnerable versions. They should also ensure that users with subscriber-level access and above do not have excessive privileges. Additionally, defenders should monitor user comments and approval processes to prevent exploitation.

Why it matters

Defenders should care about CVE-2026-107756 because it allows authenticated attackers with subscriber-level access to inject arbitrary web scripts in WordPress pages using the Meow Lightbox plugin. This can lead to Stored Cross-Site Scripting attacks when the Output Buffering option is enabled. Defenders responsible for WordPress installations with this plugin should verify the presence of vulnerable versions, assess exposure, and ensure proper user privileges to prevent exploitation.

• Authenticated attackers with subscriber-level access can inject arbitrary web scripts
• Injected scripts execute when a user accesses an injected page
• Vulnerability requires Output Buffering option to be enabled and at least one approved comment
• Verification of plugin version and Output Buffering option is necessary

Technical summary

The Meow Lightbox plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'display_name + comment' parameter in all versions up to, and including, 5.6.2. This is due to insufficient input sanitization and output escaping. An attacker with subscriber-level access and above can inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This vulnerability is only exploitable when the plugin's Output Buffering option is enabled (disabled by default), and requires the attacker to have at least one previously approved comment on the site.

Defensive priority

Defenders should prioritize verifying the presence of the Meow Lightbox plugin version 5.6.2 or earlier, checking if the Output Buffering option is enabled, and ensuring that users with subscriber-level access and above do not have excessive privileges.

Recommended defensive actions

• Verify the presence of the Meow Lightbox plugin version 5.6.2 or earlier
• Check if the Output Buffering option is enabled
• Ensure that users with subscriber-level access and above do not have excessive privileges
• Monitor user comments and approval processes
• Consider disabling the Output Buffering option if not required

Evidence notes

The CVE record and source item provide details on the vulnerability, including its description, affected versions, and exploitability conditions. However, the corpus does not establish versions, exploitation, impact, or remediation beyond these details, which require verification from the supplied official sources.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.