CVE-2026-1900Public exploitNetwork attack vector

Unauthenticated settings modification via exposed REST endpoint

Published Apr 7, 2026 · Updated Apr 7, 2026

Missing authorization in Link Whisper Free before 0.9.1 allows remote attackers to modify plugin settings and user metadata via REST requests. The link-whisper/ai-auth endpoint accepts unauthenticated POST parameters and writes AI authorization and email values into wp_options and wp_usermeta. No account or user interaction is required; the demonstrated consequence is unauthorized modification of AI-access configuration and a selected user's plugin metadata.

CVSS severity6.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Link Whisper Free before 0.9.1 allows remote attackers to modify plugin settings and user metadata via REST requests. The link-whisper/ai-auth endpoint accepts unauthenticated POST parameters and writes AI authorization and email values into wp_options and wp_usermeta. No account or user interaction is required; the demonstrated consequence is unauthorized modification of AI-access configuration and a selected user's plugin metadata.

The record

CVE
CVE-2026-1900
Published
Apr 7, 2026
Updated
Apr 7, 2026
Vendor
Link Whisper
Product
Link Whisper Free
Classifications
CWE-862, CWE-306, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Link Whisper · Link Whisper Freeversion=0 <0.9.1

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
CWE-306Missing Authentication for Critical Function
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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