Super Progressive Web Apps Plugin up to 2.2.43 on WordPress Offline Message wp_localize_script offline_message_txt cross site scripting

Summaryinfo

A vulnerability marked as problematic has been reported in Super Progressive Web Apps Plugin up to 2.2.43. The affected element is the function wp_localize_script of the component Offline Message. The manipulation of the argument offline_message_txt leads to cross site scripting. This vulnerability is uniquely identified as CVE-2026-5108. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Super Progressive Web Apps Plugin up to 2.2.43. It has been rated as problematic. This issue affects the function wp_localize_script of the component Offline Message. The manipulation of the argument offline_message_txt 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 Super Progressive Web Apps plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `superpwa_settings[offline_message_txt]` setting in all versions up to, and including, 2.2.43. This is due to insufficient input sanitization and output escaping. The offline message value is stored without sanitization, passed to the frontend via `wp_localize_script()` without escaping, and rendered using `innerHTML` in the JavaScript snackbar component. This makes it possible for authenticated attackers, with Administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user triggers the offline snackbar.

The advisory is shared at wordfence.com. The identification of this vulnerability is CVE-2026-5108 since 03/29/2026. The exploitation is known to be easy. The attack may be initiated remotely. Additional levels of successful authentication are required for exploitation. 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

Name

• Super Progressive Web Apps Plugin

Version

• 2.2.0
• 2.2.1
• 2.2.2
• 2.2.3
• 2.2.4
• 2.2.5
• 2.2.6
• 2.2.7
• 2.2.8
• 2.2.9
• 2.2.10
• 2.2.11
• 2.2.12
• 2.2.13
• 2.2.14
• 2.2.15
• 2.2.16
• 2.2.17
• 2.2.18
• 2.2.19
• 2.2.20
• 2.2.21
• 2.2.22
• 2.2.23
• 2.2.24
• 2.2.25
• 2.2.26
• 2.2.27
• 2.2.28
• 2.2.29
• 2.2.30
• 2.2.31
• 2.2.32
• 2.2.33
• 2.2.34
• 2.2.35
• 2.2.36
• 2.2.37
• 2.2.38
• 2.2.39
• 2.2.40
• 2.2.41
• 2.2.42
• 2.2.43

CPE 2.3info

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CPE 2.2info

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