CVE-2026-100182 Download Monitor <= 5.2.10 - Unauthenticated Stored Cross-Site Scripting via Cross-Origin postMessage to Admin Editor
Unauthenticated attackers can inject scripts via postMessage to admin editors, leading to stored XSS and potential account takeover when admins visit malicious pages.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-100182?
CVE-2026-100182 is a high-severity cross-site scripting vulnerability in wpchill Download Monitor, published on 2 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Download Monitor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Cross-Origin postMessage to Admin Editor in all versions up to, and including, 5.2.10 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This requires the attacker to trick an authenticated Administrator into visiting an attacker-controlled page that targets an open Download edit screen, after which the payload is persisted unfiltered via the Administrator's unfiltered_html capability and later emitted verbatim to the frontend by the [download_data] shortcode's unescaped post_content render path.
Weakness: CWE-79
Which versions are affected by CVE-2026-100182?
How do I fix CVE-2026-100182?
No fix has been published for CVE-2026-100182 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-100182 being exploited?
There is no known exploitation of CVE-2026-100182 in the wild and no public exploit code.
Sources
Also known as GHSA-377g-82j6-34xp.