Server-side request forgery in https://github.com/concrete5/concrete5
Priority MEDIUM 45CWE-918Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.
Summary
A Server-Side Request Forgery vulnerability was found in concrete5 < 8.5.5 that allowed a decimal notation encoded IP address to bypass the limitations in place for localhost allowing interaction with local services. Impact can vary depending on services exposed.CVSSv2.0 AV:A/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N
Why it matters now
EPSS 0.01226 69th percentileScored 2026-11-07
Fix Fixed concrete5/concrete5 (Packagist): 8.5.5
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | https://github.com/concrete5/concrete5 | Fixed in 8.5.5 | — | No fix listed | CNA |
| — | concrete5/concrete5 (Packagist) | before 8.5.5 | 8.5.5 | Patch available | GHSA-284f-f2hw-j2gx |
- https://github.com/concrete5/concrete5 Vendor— Affected Fixed in 8.5.5 Fixed in — No fix listed CNA
- concrete5/concrete5 (Packagist) Vendor— Affected before 8.5.5 Fixed in 8.5.5 Patch available GHSA-284f-f2hw-j2gx
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:* | before 8.5.5 | Vulnerable | Concrete CMS |
- cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:* Versions before 8.5.5 Vulnerable ·Concrete CMS
Remediation
- Fix · GHSA-284f-f2hw-j2gx concrete5/concrete5 (Packagist) Fixed in 8.5.5 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2021-22958
- 2026-10-03 Alias added: GHSA-284f-f2hw-j2gx
References
More Concrete Cms vulnerabilities
- TI-2026-23602 ConcreteCMS v9.4.7 contains a Denial of Service (DoS) vulnerability in the File Manager… CVSS 3.1MEDIUM 6.5
- TI-2023-23992 A Cross Site Scripting (XSS) vulnerability in Concrete CMS from versions 9.2.0 to 9.2.2… CVSS 3.1MEDIUM 5.4
- TI-2023-26495 Concrete CMS before 8.5.13 and 9.x before 9.2.2 allows unauthorized access because… CVSS 3.1CRITICAL 9.8
- TI-2026-14907 Missing authorization in Concrete CMS CVSS 4.0HIGH 8.7
- TI-2022-06200 Cleartext transmission of sensitive information in https://github.com/concrete5/concrete5 CVSS 3.1CRITICAL 9.8
- TI-2021-17294 An issue was discovered in Concrete CMS through 8.5.5. CVSS 3.1CRITICAL 9.8
Sources
- CVE-2021-22958 · CVE Program
- CVE-2021-22958 · NVD
- FIRST EPSS
- GHSA-284f-f2hw-j2gx · GitHub Advisory Database · CC BY 4.0
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