Coming Soon by Supsystic <= 1.7.5 - Reflected Cross-Site Scripting
Strategic Overview
- Status
- Patched in 1.7.6
- Affected Plugin
- Maintenance Mode by Supsystic
- Affected Version
<= 1.7.5- CVSS
- 6.1Medium
- Weakness type
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CVE
CVE-2021-46781
At a glance
CVE-2021-46781 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Maintenance Mode by Supsystic WordPress plugin, affecting versions <= 1.7.5. It carries a CVSS score of 6.1 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.7.6; sites on affected versions should update now. Disclosed April 2022, reported by 0xB9.
Vulnerability Overview
The Coming Soon by Supsystic WordPress plugin before 1.7.6 does not sanitise and escape the tab parameter before outputting it back in an attribute in the admin dashboard, leading to a Reflected Cross-Site Scripting
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site.
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Reaching this weakness in Maintenance Mode by Supsystic <= 1.7.5 takes a caller who can reach the endpoint. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.
Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Maintenance Mode by Supsystic the fix is 1.7.6: builds <= 1.7.5 are affected, anything from 1.7.6 onward is not.
Remediation
Update to version 1.7.6, or a newer patched version
How does WordSec protect against this?
The attempt arrives as an ordinary request to Maintenance Mode by Supsystic: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Maintenance Mode by Supsystic 1.7.6 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Related records
Other vulnerabilities in Maintenance Mode by Supsystic
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