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CVE-2026-28508

Withknown Known server-side request forgery (SSRF)

8.6 HIGHPublic exploitEPSS 0.75%
  1. Published6 Mar 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Affected products

Withknown Known< 1.6.4

Remediation

Fixed in
Withknown Known≥ 1.6.4

References

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Frequently asked

Is CVE-2026-28508 being actively exploited?

CVE-2026-28508 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.75%.

How severe is CVE-2026-28508?

CVE-2026-28508 has a CVSS 3.1 base score of 8.6, rated high. EPSS estimates a 0.75% probability of exploitation.

Which products are affected by CVE-2026-28508?

Affected products include Withknown Known.

How do I fix CVE-2026-28508?

Upgrade affected software to a fixed version, for example Withknown Known 1.6.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-28508 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.