CVE-2023-1245Public exploitNetwork attack vector

Stored script execution via unsanitized biography markdown

Published Mar 7, 2023 · Updated Mar 6, 2025

Stored XSS in the user biography feature in Apache Answer before 1.0.6 allows remote authenticated users to execute script in a viewer's browser. UpdateInfoRequest.Check converted attacker-controlled Bio markdown with Markdown2HTML and stored the resulting BioHTML without an allowlist sanitizer. A registered account and a victim who views the crafted profile are required; the script runs in the victim's Answer origin and can read or alter browser-accessible data.

CVSS severity5.4
Medium
EPSS probability0.52%
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 the user biography feature in Apache Answer before 1.0.6 allows remote authenticated users to execute script in a viewer's browser. UpdateInfoRequest.Check converted attacker-controlled Bio markdown with Markdown2HTML and stored the resulting BioHTML without an allowlist sanitizer. A registered account and a victim who views the crafted profile are required; the script runs in the victim's Answer origin and can read or alter browser-accessible data.

The record

CVE
CVE-2023-1245
Published
Mar 7, 2023
Updated
Mar 6, 2025
Vendor
The Apache Software Foundation
Product
Apache Answer
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 7, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 6, 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 <1.0.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Apache Software Foundation · Apache Answerversion=unspecified <1.0.6

Published CVSS scores

3.5@huntrdevCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/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.

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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')
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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