XSS in Jizhicms
CVE-2026-29840
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (18.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 18.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
Weakness classification (CWE)
References
- www.demo.com/user/release/molds/article.html (Broken Link)
- gist.github.com/w-p-man/790f51f918499798180a8def3a6fdfb0 (Third Party Advisory)
Frequently asked questions
- What is CVE-2026-29840?
- CVE-2026-29840 is a medium-severity vulnerability in Jizhicms, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-03-24.
- How severe is CVE-2026-29840?
- Medium severity. CVSS v3 base score is 5.4 out of 10.