Coming soon and Maintenance mode <= 3.5.2 - Authenticated Stored Cross-Site Scripting
Strategic Overview
- Status
- Patched in 3.5.3
- Affected Plugin
- Coming soon and Maintenance mode
- Affected Version
< 3.5.3- CVSS
- 6.4Medium
- Weakness type
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CVE
CVE-2021-24577
At a glance
CVE-2021-24577 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Coming soon and Maintenance mode WordPress plugin, affecting versions < 3.5.3. It carries a CVSS score of 6.4 (reachable over the network; low attack complexity). Exploitation requires an authenticated account. The issue is fixed in version 3.5.3; sites on affected versions should update now. Disclosed September 2021, reported by Asif Nawaz Minhas.
Vulnerability Overview
The Coming soon and Maintenance mode WordPress plugin before 3.5.3 does not properly sanitize inputs submitted by authenticated users when setting adding or modifying coming soon or maintenance mode pages, leading to stored XSS.
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 interaction from a victim user.
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Reaching this weakness in Coming soon and Maintenance mode < 3.5.3 takes any authenticated account. 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 Coming soon and Maintenance mode the fix is 3.5.3: builds < 3.5.3 are affected, anything from 3.5.3 onward is not.
Remediation
Update to version 3.5.3, or a newer patched version
How does WordSec protect against this?
The attempt arrives as an ordinary request to Coming soon and Maintenance mode: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Coming soon and Maintenance mode 3.5.3 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Related records
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