How severe is CVE-2026-34557?

CVE-2026-34557 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability low.

Is CVE-2026-34557 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34557?

CVE-2026-34557 affects Ci4-cms-erp Ci4ms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34557?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-34557 have an EU (EUVD) identifier?

Yes. CVE-2026-34557 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17213.

When was CVE-2026-34557 published?

CVE-2026-34557 was published on 2026-03-30 and last updated on 2026-06-17.

CVE-2026-34557

CVE-2026-34557 is a critical-severity vulnerability in Ci4-cms-erp Ci4ms with a CVSS 3.x base score of 9.1. 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: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17213
Weakness: CWE-79
Affected product: Ci4-cms-erp Ci4ms
Published: 2026-03-30
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 version 0.31.0.0, the application fails to properly sanitize user-controlled input within group and role management functionality. Multiple input fields (three distinct group-related fields) can be injected with malicious JavaScript payloads, which are then stored server-side. These stored payloads are later rendered unsafely within privileged administrative views without proper output encoding, leading to stored cross-site scripting (XSS) within the role and permission management context. This issue has been patched in version 0.31.0.0.

Frequently asked questions

What is CVE-2026-34557?: CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to version 0.31.0.0, the application fails to properly sanitize user-controlled input within group and role management functionality. Multiple input fields (three distinct group-related fields) can be injected with malicious JavaScript payloads, which are then stored server-side. These stored payloads are later rendered unsafely within privileged administrative views without proper output encoding, leading to stored cross-site scripting (XSS) within the role and permission management context. This issue has been patched in version 0.31.0.0.
How severe is CVE-2026-34557?: CVE-2026-34557 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability low.
Is CVE-2026-34557 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34557?: CVE-2026-34557 affects Ci4-cms-erp Ci4ms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34557?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-34557 have an EU (EUVD) identifier?: Yes. CVE-2026-34557 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17213.
When was CVE-2026-34557 published?: CVE-2026-34557 was published on 2026-03-30 and last updated on 2026-06-17.

References

https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-rpjr-985c-qhvm

Affected products (1)

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

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