CVE-2026-34559 json
CI4MS: Blogs Tags Full Account Takeover for All-Roles & Privilege-Escalation via Stored DOM XSS
published 2026-04-01 7 mo ago modified 2026-10-26 13 d ago also EUVD-2026-18070 , GHSA-4333-387x-w245
- cvss
- 9.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 26%
- public exploits
- 0
- none known
Summary
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 when creating or editing blog tags. An attacker can inject a malicious JavaScript payload into the tag name field, which is then stored server-side. This stored payload is later rendered unsafely across public tag pages and administrative interfaces without proper output encoding, leading to stored cross-site scripting (XSS). This issue has been patched in version 0.31.0.0.
Patch / fix
- packagist ci4-cms-erp/ci4ms 0.31.0.0
- ci4-cms-erp ci4ms 0.31.0.0
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-4333-387x-w245 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L |
| GitHub | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L |
| NVD | 3.1 | 9.0 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | ci4-cms-erp/ci4ms | <0.31.0.0 |
0.31.0.0 |
Affected products
- ci4-cms-erp ci4ms
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/ci4-cms-erp/ci4ms/security/advisories/GHSA-4333-387x-w245
exploit, web, vendor-advisory
-
github.com
/ci4-cms-erp/ci4ms/releases/tag/0.31.0.0
web, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-34559
advisory
-
github.com
/ci4-cms-erp/ci4ms
package
Sources
- CVE List CVE-2026-34559
- GitHub Advisory GHSA-4333-387x-w245
- NVD CVE-2026-34559
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.