CVE-2023-0743Public exploitNetwork attack vector

Cross-site scripting via untyped avatar responses

Published Feb 8, 2023 · Updated Mar 25, 2025

Cross-site scripting in Apache Answer before 1.0.4 allows remote authenticated users to execute script through crafted avatar content. AvatarThumb returns avatar bytes without assigning the response Content-Type from the file extension, so a browser interprets crafted content as active script. A registered user must supply the avatar content and another user must load it; execution occurs in the viewer's browser context.

CVSS severity9.0
Critical
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Apache Answer before 1.0.4 allows remote authenticated users to execute script through crafted avatar content. AvatarThumb returns avatar bytes without assigning the response Content-Type from the file extension, so a browser interprets crafted content as active script. A registered user must supply the avatar content and another user must load it; execution occurs in the viewer's browser context.

The record

CVE
CVE-2023-0743
Published
Feb 8, 2023
Updated
Mar 25, 2025
Vendor
The Apache Software Foundation
Product
Apache Answer
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 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=unspecified <1.0.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Apache Software Foundation · Apache Answerversion=unspecified <1.0.4

Published CVSS scores

9.0NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
8.2huntr.devCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A: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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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