CVE-2023-34103Public exploitNetwork attack vector

Stored XSS via unsanitized HTML field rendering

Published Jun 5, 2023 · Updated Jan 8, 2025

Stored XSS in Avo 2.33.2 and earlier and 3.0.0.pre1 through 3.0.0.pre12 allows remote authenticated users to run scripts. Affected ERB templates use raw-output tags for Trix values, messages, help text, and HTML headings without sanitizing attacker-controlled markup. Form-edit privileges permit persistence, and another user must view the affected content for script execution in that user's browser.

CVSS severity7.3
High
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Avo 2.33.2 and earlier and 3.0.0.pre1 through 3.0.0.pre12 allows remote authenticated users to run scripts. Affected ERB templates use raw-output tags for Trix values, messages, help text, and HTML headings without sanitizing attacker-controlled markup. Form-edit privileges permit persistence, and another user must view the affected content for script execution in that user's browser.

The record

CVE
CVE-2023-34103
Published
Jun 5, 2023
Updated
Jan 8, 2025
Vendor
Avo
Product
Avo
Classifications
CWE-79, CWE-80, T1203
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

5.4NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
7.3GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1203Exploitation for Client Execution

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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