How severe is CVE-2026-39391?

CVE-2026-39391 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-39391 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-39391?

CVE-2026-39391 affects Ci4-cms-erp Ci4ms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-39391?

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

Does CVE-2026-39391 have an EU (EUVD) identifier?

Yes. CVE-2026-39391 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20484.

When was CVE-2026-39391 published?

CVE-2026-39391 was published on 2026-04-08 and last updated on 2026-06-17.

CVE-2026-39391

CVE-2026-39391 is a medium-severity vulnerability in Ci4-cms-erp Ci4ms with a CVSS 3.x base score of 4.8. 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 4.8)
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-20484
Weakness: CWE-79
Affected product: Ci4-cms-erp Ci4ms
Published: 2026-04-08
Last modified: 2026-06-17

Description

CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to 0.31.4.0, the blacklist (ban) note parameter in UserController::ajax_blackList_post() is stored in the database without sanitization and rendered into an HTML data-note attribute without escaping. An admin with blacklist privileges can inject arbitrary JavaScript that executes in the browser of any other admin who views the user management page. This vulnerability is fixed in 0.31.4.0.

Frequently asked questions

What is CVE-2026-39391?: CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to 0.31.4.0, the blacklist (ban) note parameter in UserController::ajax_blackList_post() is stored in the database without sanitization and rendered into an HTML data-note attribute without escaping. An admin with blacklist privileges can inject arbitrary JavaScript that executes in the browser of any other admin who views the user management page. This vulnerability is fixed in 0.31.4.0.
How severe is CVE-2026-39391?: CVE-2026-39391 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-39391 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-39391?: CVE-2026-39391 affects Ci4-cms-erp Ci4ms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-39391?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-39391 have an EU (EUVD) identifier?: Yes. CVE-2026-39391 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20484.
When was CVE-2026-39391 published?: CVE-2026-39391 was published on 2026-04-08 and last updated on 2026-06-17.

References

https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-7cm9-v848-cfh2

Affected products (1)

cpe:2.3:a:ci4-cms-erp:ci4ms:*:*:*:*:*:*:*:*

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