CVE-2026-9016 Debug Log Manager <= 2.5.0 - Unauthenticated Improper Output Neutralization for Logs via log_js_errors AJAX Action
Unauthenticated attackers can inject forged entries into WordPress debug logs via a publicly exposed nonce, obscuring malicious activity and misleading administrators.
- 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-2026-9016?
CVE-2026-9016 is a medium-severity vulnerability in qriouslad Debug Log Manager – Conveniently Monitor and Inspect Errors, published on 6 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Debug Log Manager – Conveniently Monitor and Inspect Errors plugin for WordPress is vulnerable to Improper Output Neutralization for Logs in all versions up to, and including, 2.5.0. This is due to the `log_js_errors()` AJAX handler being registered for unauthenticated users via `wp_ajax_nopriv_log_js_errors` and gated only by a nonce that is publicly disclosed in every front-end page's HTML through `wp_localize_script()` whenever JavaScript error logging is enabled, providing no real authorization barrier. This makes it possible for unauthenticated attackers to inject arbitrary forged entries into the site's WordPress debug log by supplying attacker-controlled values for the `message`, `script`, `lineNo`, `columnNo`, and `pageUrl` fields — enabling spoofing of error and incident records, obscuring malicious activity within fabricated log noise, and misleading administrators who rely on the log for triage. This vulnerability is only exploitable when the plugin's JavaScript error logging feature is enabled, as the requisite nonce is only published into the page HTML under that condition.
Weakness: CWE-117
Which versions are affected by CVE-2026-9016?
How do I fix CVE-2026-9016?
No fix has been published for CVE-2026-9016 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-9016 being exploited?
There is no known exploitation of CVE-2026-9016 in the wild and no public exploit code.
Sources
Also known as GHSA-mqgx-5f5c-w96h.