CVE-2026-67617 Microweber CMS 2.0.20 Stored XSS via tag_names Parameter
Admin-authenticated attackers can inject malicious JavaScript via the tag_names parameter, leading to script execution for visitors and potential session hijacking.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-67617?
CVE-2026-67617 is a medium-severity cross-site scripting vulnerability in microweber, published on 3 Aug 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
Microweber CMS through 2.0.20 contains a stored cross-site scripting vulnerability in the content tagging system that allows admin-authenticated attackers to inject arbitrary JavaScript by submitting malicious payloads via the tag_names parameter of the GET /api/save_content_admin endpoint, bypassing three independent sanitization controls including XSS middleware that ignores GET requests, a strip_unsafe() function that only matches double-quoted onerror attributes, and a titlecase normalizer that passes HTML decimal entity-encoded payloads through unchanged. Attackers can store malicious scripts that execute without user interaction for every visitor to the public blog page and within the admin post editor, enabling session riding through same-origin fetch requests using the CSRF token embedded in the page.
Weakness: CWE-79
Which versions are affected by CVE-2026-67617?
How do I fix CVE-2026-67617?
No fix has been published for CVE-2026-67617 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-2026-67617 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-67617 exists.
Sources
Also known as GHSA-793c-7c93-m769.