CVE-2026-78292Network attack vector

PHP object injection via deserialized entry values

Published Aug 27, 2026 · Updated Aug 27, 2026

PHP object injection in HashThemes Hash Form 1.4.1 and earlier allows remote attackers to instantiate objects via crafted form entries. A crafted entry value is stored and deserialized when an administrator opens the Entries list, instantiating attacker-controlled PHP objects. This unauthenticated path requires an administrator to view the list, and no concrete post-instantiation action is published.

CVSS severity9.8
Critical
EPSS probability0.53%
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 HashThemes Hash Form 1.4.1 and earlier allows remote attackers to instantiate objects via crafted form entries. A crafted entry value is stored and deserialized when an administrator opens the Entries list, instantiating attacker-controlled PHP objects. This unauthenticated path requires an administrator to view the list, and no concrete post-instantiation action is published.

The record

CVE
CVE-2026-78292
Published
Aug 27, 2026
Updated
Aug 27, 2026
Vendor
HashThemes
Product
Hash Form
Classifications
CWE-502, CAPEC-586, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 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=n/a <=1.4.1 changes=[{"at":"1.4.2","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

HashThemes · Hash Formversion=n/a <=1.4.1 changes=[{"at":"1.4.2","status":"unaffected"}]

Published CVSS scores

9.8PatchstackCVSS:3.1/AV:N/AC:L/PR:N/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.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
CAPEC-586Object Injection
T1190Exploit Public-Facing Application

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

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Your stack

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