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Is A Backdoor - Security Vulnerability (CVE-2026-15413)

CVE-2026-15413

Vulnerability CVE-2026-15413 PLUGIN is-a-backdoor CRITICAL

The Link Factory WordPress plugin is a backdoor. Distributed as a "homepage sentence publisher", it exposes an operator-controlled REST API under /wp-json/link-factory/v1/ - authenticated by a detached Ed25519 signature verified against a hardcoded operator public key (except for the health check).

CVE-2026-15413

CRITICAL CVSS 10.0 Published 2026-08-13 Updated 2026-08-26
AI Risk Critical (92/100) Active Exploit: No strong signal Published Exploit: No public exploit references Priority: P1 Immediate
Severity Band CRITICAL
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Affected Components 2
Reference Links 1
AI Risk Engine Critical (92/100)
Exploitability High
Active Exploitation No strong signal
Published Exploit Status No public exploit references

Threat Timeline

  1. 2026-08-13 CVE published and first recorded in the threat feed.
  2. 2026-08-26 Record updated with latest vulnerability metadata.
  3. 2026-08-14 AI technical context refreshed for mitigation and impact guidance.
  4. Now Monitoring for follow-up changes, linked references, and new related CVEs.

AI Context

Machine-generated threat intelligence

AI Updated 22 days ago

AI enriched 22 days ago (2026-08-14 02:02 UTC)

Technical Summary

The Link Factory WordPress plugin is a backdoor. Distributed as a "homepage sentence publisher", it exposes an operator-controlled REST API under /wp-json/link-factory/v1/ - authenticated by a detached Ed25519 signature verified against a hardcoded operator public key (except for the health check).

Potential Impact

Severity is CRITICAL (CVSS 10.0). Depending on deployment context, affected components may be exposed to unauthorized actions or data integrity risk.

Exploitability Assessment

Exploitability is assessed as High based on severity and technical exposure profile.

Primary risk drivers: severity and technical exposure profile

Mitigation Recommendations

Validate affected product versions, prioritize patching, and monitor references for vendor remediation guidance. If immediate patching is not possible, apply compensating controls and limit exposure of vulnerable surfaces.

Detection & Monitoring

Track authentication anomalies, unexpected file writes, and suspicious plugin API activity around affected components.

Business Impact Lens

AI risk score 92/100 (Critical, High) with priority P1 Immediate. Prioritize remediation where affected components process customer data, admin sessions, or Internet-exposed workflows.

Affected Products

Is A Backdoor PLUGIN · is-a-backdoor Affected: >= 0, <= 0 Fixed version not specified
Link Factory PLUGIN · link-factory Affected: >= 0, <= 0 Fixed version not specified

Related Vulnerabilities

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No related vulnerability records were found yet for this context.

References

What to do about this

Patch immediately Serious, and reachable without meaningful privilege.

Fix it

Update Is A Backdoor to the latest available version.

Where the vendor has not published a fix yet, disable the plugin until they do.

No Hack Halt control meaningfully contains this one — updating is the remedy. We would rather say so than sell you something that will not help.

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Not sure if you are affected?

Scan your site to see whether it runs Is A Backdoor, and at which version.

Free, no installation, no account. It reads what your site already publishes, then tells you which plugins carry known vulnerabilities and what to do about each one.

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Am I affected by this vulnerability?

You are affected if your site runs Is A Backdoor.

How do I fix it?

Update Is A Backdoor to the latest available version. Where the vendor has not yet published a fix, remove or disable the plugin until they do.

WordPress security that blocks attacks before they land.

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