CVE-2026-30879 baserCMS: Cross-site scripting vulnerability in blog post
Attackers can inject malicious scripts into blog posts, potentially stealing user sessions or executing code in victim browsers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-30879?
CVE-2026-30879 is a medium-severity cross-site scripting vulnerability in Basercms Basercms, published on 31 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
baserCMS is a website development framework. Prior to version 5.2.3, baserCMS has a cross-site scripting vulnerability in blog posts. This issue has been patched in version 5.2.3.
Weakness: CWE-79
Which versions are affected by CVE-2026-30879?
2 open source packages ship an affected version, including baserproject/basercms. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
baserproject/basercms Packagist | All versions | 5.2.3 |
baserproject/basercms Packagist | All versions | 5.2.3 |
Products include Basercms Basercms.
How do I fix CVE-2026-30879?
Upgrade baserproject/basercms to 5.2.3 or later.
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-2026-30879 being exploited?
There is no known exploitation of CVE-2026-30879 in the wild and no public exploit code.
Other vulnerabilities in Basercms Basercms
- CVE-2023-25654 baserCMS File Uploader Remote Code Execution (RCE) vulnerability
- CVE-2023-25655 baserCMS allows any file to be uploaded
- CVE-2017-10842 baserCMS SQL Injection vulnerability
- CVE-2026-30880 baserCMS: OS command injection vulnerability in installer
- CVE-2026-21861 baserCMS: OS Command Injection Leading to Remote Code Execution (RCE)
Sources
Also known as GHSA-jmq3-x8q7-j9qm.