What is 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 tags but fails to recursively remove dangerous event handlers in other HTML tags (such as onerror in 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.

How severe is CVE-2026-29840?

CVE-2026-29840 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-29840 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-29840?

CVE-2026-29840 affects Jizhicms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-29840?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-29840 have an EU (EUVD) identifier?

Yes. CVE-2026-29840 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14905.

When was CVE-2026-29840 published?

CVE-2026-29840 was published on 2026-03-24 and last updated on 2026-06-17.

CVE-2026-29840

CVE-2026-29840 is a medium-severity vulnerability in Jizhicms with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-14905
Weakness: CWE-79
Affected product: Jizhicms
Published: 2026-03-24
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-29840?: CVE-2026-29840 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-29840 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-29840?: CVE-2026-29840 affects Jizhicms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-29840?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-29840 have an EU (EUVD) identifier?: Yes. CVE-2026-29840 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14905.
When was CVE-2026-29840 published?: CVE-2026-29840 was published on 2026-03-24 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:jizhicms:jizhicms:*:*:*:*:*:*:*:*

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