CVE-2026-78834 Code injection in n/a
Authenticated low-privileged users can execute arbitrary code on the server via crafted content in the CoAuthors plugin for CMSimple.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-78834?
CVE-2026-78834 is a high-severity code injection vulnerability in n/a, published on 8 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A code execution vulnerability exists in CMSimple 5.22 in the CoAuthors plugin. An authenticated low-privileged user who can modify page content and provide controlled imported content can trigger server-side execution by referencing crafted external or uploaded text content through the affected content import feature.
Weakness: CWE-94
Which versions are affected by CVE-2026-78834?
How do I fix CVE-2026-78834?
No fix has been published for CVE-2026-78834 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-78834 being exploited?
There is no known exploitation of CVE-2026-78834 in the wild and no public exploit code.
Sources
Also known as GHSA-x6hj-fj57-58jm.