CVE-2024-2721Public exploitNetwork attack vector

Authenticated object injection via imported URL deserialization

Published Mar 20, 2024 · Updated Apr 28, 2026

PHP object injection in Sygnoos Social Media Share Buttons 2.1.0 and earlier allows remote authenticated users to alter site data via imports. The importButtons method reads attachmentUrl from the import_buttons AJAX action, fetches that caller-controlled URL with file_get_contents, and passes the returned bytes directly to unserialize. Any authenticated WordPress account can reach the action; object-instantiation consequences depend on a usable gadget chain in the site's loaded PHP code.

CVSS severity8.2
High
EPSS probability0.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

PHP object injection in Sygnoos Social Media Share Buttons 2.1.0 and earlier allows remote authenticated users to alter site data via imports. The importButtons method reads attachmentUrl from the import_buttons AJAX action, fetches that caller-controlled URL with file_get_contents, and passes the returned bytes directly to unserialize. Any authenticated WordPress account can reach the action; object-instantiation consequences depend on a usable gadget chain in the site's loaded PHP code.

The record

CVE
CVE-2024-2721
Published
Mar 20, 2024
Updated
Apr 28, 2026
Vendor
Sygnoos
Product
Social Media Share Buttons
Classifications
CWE-502, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 20, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 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 <=2.1.0
  2. Affected versionversion=n/a <=2.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Sygnoos · Social Media Share Buttonsversion=0 <=2.1.0; version=n/a <=2.1.0

Published CVSS scores

8.2PatchstackCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
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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