CVE-2026-93872Public exploitNetwork attack vector

Authenticated code execution via unrestricted PHP deserialization

Published Sep 18, 2026 · Updated Sep 18, 2026

PHP object injection in Cotonti 1.0.0 allows remote authenticated users to execute code or write files through the comments plugin. EditAction::prepareComeBack() base64-decodes the cb parameter and passes it to unserialize() without disabling class instantiation. Exploitation requires comment write permission and a usable PHP gadget chain; arbitrary object instantiation can write files or execute code.

CVSS severity7.7
High
EPSS probability0.71%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

PHP object injection in Cotonti 1.0.0 allows remote authenticated users to execute code or write files through the comments plugin. EditAction::prepareComeBack() base64-decodes the cb parameter and passes it to unserialize() without disabling class instantiation. Exploitation requires comment write permission and a usable PHP gadget chain; arbitrary object instantiation can write files or execute code.

The record

CVE
CVE-2026-93872
Published
Sep 18, 2026
Updated
Sep 18, 2026
Vendor
Cotonti
Product
Cotonti
Classifications
CWE-502, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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=1.0.0 <=1.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Cotonti · Cotontiversion=1.0.0 <=1.0.0

Published CVSS scores

7.7VulnCheckCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.5VulnCheckCVSS:3.1/AV:N/AC:H/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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 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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