CVE-2025-11587Public exploitNetwork attack vector

Subscriber-level configuration takeover via unchecked activation

Published Oct 29, 2025 · Updated Oct 29, 2025

Missing authorization in Call Now Button 1.5.3 and earlier allows remote authenticated users to alter site-wide button settings. The activate method accepts an api_key or api_key_ott query value and writes it into the persistent cnb option without a capability check or nonce validation. Subscriber access is sufficient on a fresh installation with no API key, allowing an attacker-controlled cloud account to add or replace visitor-facing buttons.

CVSS severity4.3
Medium
EPSS probability0.22%
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 Call Now Button 1.5.3 and earlier allows remote authenticated users to alter site-wide button settings. The activate method accepts an api_key or api_key_ott query value and writes it into the persistent cnb option without a capability check or nonce validation. Subscriber access is sufficient on a fresh installation with no API key, allowing an attacker-controlled cloud account to add or replace visitor-facing buttons.

The record

CVE
CVE-2025-11587
Published
Oct 29, 2025
Updated
Oct 29, 2025
Vendor
StudioStacks B.V.
Product
Call Now Button
Classifications
CWE-862, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 29, 2025Record 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=* <=1.5.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

StudioStacks B.V. · Call Now Buttonversion=* <=1.5.3

Published CVSS scores

4.3WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
T1565.001Stored Data Manipulation

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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