CVE-2026-29840

Name: CVE-2026-29840
Creator: NVD / NIST
Published: 2026-03-24T16:16:30.907+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.17%

Last modified Jun 17, 2026

CVE-2026-29840 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. 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). EPSS estimates a 0.17% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.4/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.17%

6.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Jizhicms	Jizhicms	<= 2.5.6

References

http://www.demo.com/user/release/molds/article.htmlBroken Link
https://gist.github.com/w-p-man/790f51f918499798180a8def3a6fdfb0Third Party Advisory

Timeline

Published: Mar 24, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-29840?

How severe is CVE-2026-29840?

CVE-2026-29840 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.

How do I fix CVE-2026-29840?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-29840?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST