CVE-2024-43800Network attack vector

Cross-site scripting via linked directory redirects

Published Sep 10, 2024 · Updated Sep 10, 2024

Cross-site scripting in Express.js serve-static before 1.16.0 and 2.0.0 before 2.1.0 allows remote attackers to execute script via redirects. The createRedirectDirectoryListener function places an escaped, attacker-influenced redirect location into an HTML anchor, leaving the destination active as a clickable browser URL. Exploitation requires control of the redirect input, delayed redirect completion, and a user click; successful execution affects the user's browser context.

CVSS severity2.3
Low
EPSS probability0.63%
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 Express.js serve-static before 1.16.0 and 2.0.0 before 2.1.0 allows remote attackers to execute script via redirects. The createRedirectDirectoryListener function places an escaped, attacker-influenced redirect location into an HTML anchor, leaving the destination active as a clickable browser URL. Exploitation requires control of the redirect input, delayed redirect completion, and a user click; successful execution affects the user's browser context.

The record

CVE
CVE-2024-43800
Published
Sep 10, 2024
Updated
Sep 10, 2024
Vendor
Express.js
Product
serve-static
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 10, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 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=< 1.16.0
  2. Affected versionversion=>= 2.0.0, < 2.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Express.js · serve-staticversion=< 1.16.0; version=>= 2.0.0, < 2.1.0

Published CVSS scores

5.0GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
4.7NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
2.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L

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')
T1189Drive-by Compromise

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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