CVE-2022-39239Network attack vector

Stored XSS and SSRF via forwarded-protocol cache poisoning

Published Sep 23, 2022 · Updated Apr 23, 2025

SSRF and stored XSS in Netlify IPX before 1.2.3 allow remote attackers to fetch arbitrary images and poison shared caches. The createIPXHandler function accepts X-Forwarded-Proto verbatim when constructing the request origin, letting a crafted protocol value bypass the configured source-domain allowlist. A site must use the image handler with an allowed source domain; a malicious SVG served outside an img element executes script from the site origin, while Netlify-hosted deployments are protected by CDN header sanitization.

CVSS severity6.1
Medium
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF and stored XSS in Netlify IPX before 1.2.3 allow remote attackers to fetch arbitrary images and poison shared caches. The createIPXHandler function accepts X-Forwarded-Proto verbatim when constructing the request origin, letting a crafted protocol value bypass the configured source-domain allowlist. A site must use the image handler with an allowed source domain; a malicious SVG served outside an img element executes script from the site origin, while Netlify-hosted deployments are protected by CDN header sanitization.

The record

CVE
CVE-2022-39239
Published
Sep 23, 2022
Updated
Apr 23, 2025
Vendor
Netlify
Product
Netlify IPX
Classifications
CWE-79, CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 23, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 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=< 1.2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Netlify · Netlify IPXversion=< 1.2.3

Published CVSS scores

5.4NISTCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
6.1GitHubCVSS: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')
CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

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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