High severity8.6NVD Advisory· Published Mar 6, 2026· Updated Jun 17, 2026
CVE-2026-28508
CVE-2026-28508
Description
Idno is a social publishing platform. Prior to version 1.6.4, a logic error in the API authentication flow causes the CSRF protection on the URL unfurl service endpoint to be trivially bypassed by any unauthenticated remote attacker. Combined with the absence of a login requirement on the endpoint itself, this allows an attacker to force the server to make arbitrary outbound HTTP requests to any host, including internal network addresses and cloud instance metadata services, and retrieve the response content. This issue has been patched in version 1.6.4.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
idno/knownPackagist | < 1.6.4 | 1.6.4 |
Affected products
3- idno/idnov5Range: < 1.6.4
Patches
Vulnerability mechanics
References
4- github.com/idno/idno/security/advisories/GHSA-fcrh-fqxh-6fx6nvdExploitMitigationVendor AdvisoryWEB
- github.com/advisories/GHSA-fcrh-fqxh-6fx6ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-28508ghsaADVISORY
- github.com/idno/idno/releases/tag/1.6.4nvdProductRelease NotesWEB
News mentions
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