Critical severity9.8NVD Advisory· Published Oct 7, 2021· Updated Jun 17, 2026
CVE-2021-22958
CVE-2021-22958
Description
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
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
concrete5/concrete5Packagist | < 8.5.5 | 8.5.5 |
Affected products
2- concrete5/concrete5description
Patches
Vulnerability mechanics
References
5- documentation.concretecms.org/developers/introduction/version-history/855-release-notesnvdRelease NotesVendor AdvisoryWEB
- github.com/advisories/GHSA-284f-f2hw-j2gxghsaADVISORY
- hackerone.com/reports/863221nvdIssue TrackingPermissions RequiredThird Party AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2021-22958ghsaADVISORY
- github.com/concrete5/concrete5/pull/8826ghsaWEB
News mentions
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