CVE-2023-3580Public exploitNetwork attack vector

Authenticated HTML injection via unencoded Markdown entities

Published Jul 10, 2023 · Updated Oct 30, 2024

HTML injection in Squidex before 7.4.0 allows remote authenticated users to alter rendered pages through crafted Markdown content. The management UI renders user-controlled Markdown without correctly encoding HTML entities, causing supplied markup to be interpreted as page content. App-level content-writing access is required; injected markup can alter displayed content and expose data available to the viewing session.

CVSS severity5.4
Medium
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTML injection in Squidex before 7.4.0 allows remote authenticated users to alter rendered pages through crafted Markdown content. The management UI renders user-controlled Markdown without correctly encoding HTML entities, causing supplied markup to be interpreted as page content. App-level content-writing access is required; injected markup can alter displayed content and expose data available to the viewing session.

The record

CVE
CVE-2023-3580
Published
Jul 10, 2023
Updated
Oct 30, 2024
Vendor
Squidex
Product
Squidex
Classifications
CWE-167
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 30, 2024Record 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=0 <7.4.0
  2. Affected versionversion=unspecified <7.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Squidex · Squidexversion=0 <7.4.0; version=unspecified <7.4.0

Published CVSS scores

5.4huntr.devCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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-167Improper Handling of Additional Special Element

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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