CVE-2021-22958 json
Server-Side Request Forgery vulnerability in concrete5
published 2021-10-07 5 y ago modified 2026-06-17 4 mo ago also GHSA-284f-f2hw-j2gx , EUVD-2021-2139
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.2%
- EPSS 1.2% chance of exploitation in 30 days, percentile 69%
- public exploits
- 0
- none known
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
Patch / fix
- packagist concrete5/concrete5 8.5.5
- concretecms concrete_cms 8.5.5
- github.com/concrete5/concrete5#8826 pull request
Exploit prediction
1.23% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
| GitHub | 3.1 | 8.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | concrete5/concrete5 | <8.5.5 |
8.5.5 |
Affected products
- n/a https://github.com/concrete5/concrete5
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
-
github.com
/concrete5/concrete5/pull/8826
web
-
documentation.concretecms.org
/developers/introduction/version-history/855-release-notes
web, release-notes, vendor-advisory
-
hackerone.com
/reports/863221
web, issue-tracking, permissions-required, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-22958
advisory
-
github.com
/concrete5/concrete5
package
Sources
- CVE List CVE-2021-22958
- GitHub Advisory GHSA-284f-f2hw-j2gx
- NVD CVE-2021-22958
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