CVE-2023-23627Network attack vector

Cross-site scripting via noscript parsing mismatch

Published Jan 27, 2023 · Updated Mar 10, 2025

Cross-site scripting in Ryan Grove Sanitize 5.0.0 through 6.0.0 allows attackers to inject arbitrary HTML via crafted input. Nokogiri parses allowlisted noscript contents with scripting disabled, while browsers reinterpret the same markup with scripting enabled. Exploitation requires a custom allowlist containing noscript and user interaction to render the sanitized output; default configurations are not exposed.

CVSS severity6.1
Medium
EPSS probability0.53%
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 Ryan Grove Sanitize 5.0.0 through 6.0.0 allows attackers to inject arbitrary HTML via crafted input. Nokogiri parses allowlisted noscript contents with scripting disabled, while browsers reinterpret the same markup with scripting enabled. Exploitation requires a custom allowlist containing noscript and user interaction to render the sanitized output; default configurations are not exposed.

The record

CVE
CVE-2023-23627
Published
Jan 27, 2023
Updated
Mar 10, 2025
Vendor
Ryan Grove
Product
Sanitize
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 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=>= 5.0.0, < 6.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ryan Grove · Sanitizeversion=>= 5.0.0, < 6.0.1

Published CVSS scores

6.1NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/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.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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