CVE-2026-11860

Code execution via plaintext serialized payload tampering

Published Jun 15, 2026 · Updated Jun 15, 2026

Unsafe deserialization in OpenSolution Quick.Cms 6.8 and earlier allows man-in-the-middle attackers to execute server code. Quick.Cms accepts serialized data over plaintext HTTP and unserializes it without integrity, authenticity, validation, or class restrictions, enabling injected objects to invoke magic methods and gadget chains. An administrator must access the admin panel while the attacker can alter the traffic; successful exploitation runs arbitrary code on the server.

CVSS severity7.5
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Unsafe deserialization in OpenSolution Quick.Cms 6.8 and earlier allows man-in-the-middle attackers to execute server code. Quick.Cms accepts serialized data over plaintext HTTP and unserializes it without integrity, authenticity, validation, or class restrictions, enabling injected objects to invoke magic methods and gadget chains. An administrator must access the admin panel while the attacker can alter the traffic; successful exploitation runs arbitrary code on the server.

The record

CVE
CVE-2026-11860
Published
Jun 15, 2026
Updated
Jun 15, 2026
Vendor
OpenSolution
Product
Quick.Cms
Classifications
CWE-94, CWE-502, T1557
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <=6.8

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

OpenSolution · Quick.Cmsversion=0 <=6.8

Published CVSS scores

7.5CERT.PLCVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-502Deserialization of Untrusted Data
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo