CVE-2022-39348Public exploitNetwork attack vector

Cross-site scripting via unescaped Host header

Published Oct 26, 2022 · Updated Nov 3, 2025

Cross-site scripting in Twisted before 22.10.0rc1 allows attackers to inject HTML and script through a crafted Host header. NameVirtualHost returns a NoResource page for an unmatched host and inserts the request Host value into the 404 body without HTML escaping. Exploitation requires a privileged position that permits Host-header modification and user interaction, allowing attacker-supplied script to run in the response viewer's browser.

CVSS severity5.4
Medium
EPSS probability1.24%
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 Twisted before 22.10.0rc1 allows attackers to inject HTML and script through a crafted Host header. NameVirtualHost returns a NoResource page for an unmatched host and inserts the request Host value into the 404 body without HTML escaping. Exploitation requires a privileged position that permits Host-header modification and user interaction, allowing attacker-supplied script to run in the response viewer's browser.

The record

CVE
CVE-2022-39348
Published
Oct 26, 2022
Updated
Nov 3, 2025
Vendor
Twisted
Product
Twisted
Classifications
CWE-79, CWE-80, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 26, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 0.9.4, < 22.10.0rc1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Twisted · Twistedversion=>= 0.9.4, < 22.10.0rc1

Published CVSS scores

5.1GitHub Advisory Database via OSVCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
5.4GitHub, Inc.CVSS: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.

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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