CVE-2023-34102Public exploitNetwork attack vector

Application crash via unvalidated polymorphic class

Published Jun 5, 2023 · Updated Jan 8, 2025

Unsafe reflection in Avo 2.33.2 and earlier and 3.0.0.pre1 through 3.0.0.pre12 allows remote authenticated users to corrupt records. The polymorphic field's fill_field method writes an unvalidated type parameter into the association, and later class resolution uses that attacker-selected Rails class. Access to create or update a polymorphic resource is required; viewing a manipulated record can crash affected pages, while code execution remains a listed but unverified impact.

CVSS severity8.3
High
EPSS probability1.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe reflection in Avo 2.33.2 and earlier and 3.0.0.pre1 through 3.0.0.pre12 allows remote authenticated users to corrupt records. The polymorphic field's fill_field method writes an unvalidated type parameter into the association, and later class resolution uses that attacker-selected Rails class. Access to create or update a polymorphic resource is required; viewing a manipulated record can crash affected pages, while code execution remains a listed but unverified impact.

The record

CVE
CVE-2023-34102
Published
Jun 5, 2023
Updated
Jan 8, 2025
Vendor
Avo
Product
Avo
Classifications
CWE-470, CWE-20, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 5, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 8, 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=<= 2.33.2
  2. Affected versionversion=>= 3.0.0.pre1, <= 3.0.0.pre12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Avo · Avoversion=<= 2.33.2; version=>= 3.0.0.pre1, <= 3.0.0.pre12

Published CVSS scores

8.8NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-470Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')
CWE-20Improper Input Validation
T1499Endpoint Denial of Service

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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