CVE-2026-29840 Cross-site scripting in n/a
Authenticated attackers can inject malicious scripts via the release function due to insufficient input sanitization, potentially leading to session hijacking or code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-29840?
CVE-2026-29840 is a medium-severity cross-site scripting vulnerability in n/a, published on 24 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
JiZhiCMS v2.5.6 and before contains a Stored Cross-Site Scripting (XSS) vulnerability in the release function within app/home/c/UserController.php. The application attempts to sanitize input by filtering <script> tags but fails to recursively remove dangerous event handlers in other HTML tags (such as onerror in <img> tags). This allows an authenticated remote attacker to inject arbitrary web script or HTML via the body parameter in a POST request to /user/release.html.
Weakness: CWE-79
Which versions are affected by CVE-2026-29840?
It affects 1 product.
Products include Jizhicms Jizhicms.
How do I fix CVE-2026-29840?
No fix has been published for CVE-2026-29840 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-2026-29840 being exploited?
There is no known exploitation of CVE-2026-29840 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-ffqv-44jp-mf9x.