CVE-2026-28508: Idno is a social publishing platform

Q: How do I fix CVE-2026-28508?

known: upgrade to 1.6.4. Exact commands for each OS are on this page.

Q: Is CVE-2026-28508 being exploited?

CVE-2026-28508 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-28508 affect?

CVE-2026-28508 affects known. Severity is high (CVSS 8.6). 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. Combin

Q: How urgent is CVE-2026-28508?

Priority 53/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 8.6REMOTEUPGRADE

CVE-2026-28508 is a high-severity flaw (CVSS 8.6) affecting known. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 clou

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.6 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 49%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-03-06
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: withknown

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-06 05:16 UTCPublished CVE record published
2026-06-17 10:28 UTCUpdated Record last modified

withknown known UPGRADE

Affected: < 1.6.4

Fixed in: 1.6.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy known || rpm -q known || known --version

2. UPGRADE to 1.6.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade known

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade known

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-28508?

known: upgrade to 1.6.4. Exact commands for each OS are on this page.

Is CVE-2026-28508 being exploited?

CVE-2026-28508 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-28508 affect?

CVE-2026-28508 affects known. Severity is high (CVSS 8.6). 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. Combin

How urgent is CVE-2026-28508?

Priority 53/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-28507 HIGH 7.2 UPGRADE Idno is a social publishing platform
CVE-2026-26273 CRITICAL 9.8 UPGRADE Known is a social publishing platform

References

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