CVE-2026-28508 json
Idno: Unauthenticated SSRF via URL Unfurl Endpoint
published 2026-03-02 8 mo ago modified 2026-06-17 4 mo ago also GHSA-fcrh-fqxh-6fx6 , EUVD-2026-9984
- cvss
- 8.6
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 53%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 8 mo ago
Exploit prediction
0.71% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/idno/idno/security/advisories/GHSA-fcrh-fqxh-6fx6 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 9.2 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N |
| CNA | 4.0 | 9.2 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | idno/known | <1.6.4 |
1.6.4 |
Affected products
- idno idno
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
-
github.com
/idno/idno/security/advisories/GHSA-fcrh-fqxh-6fx6
web, exploit, mitigation, vendor-advisory
-
github.com
/idno/idno/releases/tag/1.6.4
web, product, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-28508
advisory
-
github.com
/idno/idno
package
Sources
- CVE List CVE-2026-28508
- GitHub Advisory GHSA-fcrh-fqxh-6fx6
- NVD CVE-2026-28508
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