CVE-2024-43370Network attack vector

Cross-site scripting via partial plural-form validation

Published Aug 15, 2024 · Updated Aug 16, 2024

Cross-site scripting in guillaumepotier gettext.js before 2.0.3 allows remote attackers to execute JavaScript via a corrupted .po catalog. The plural-form parser validates only a permitted prefix, then passes the entire plural-forms field to the Function constructor, allowing a malicious suffix to execute. Exploitation requires control of a loaded definition catalog and exposes data and actions available to the consuming JavaScript context.

CVSS severity7.2
High
EPSS probability0.38%
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 guillaumepotier gettext.js before 2.0.3 allows remote attackers to execute JavaScript via a corrupted .po catalog. The plural-form parser validates only a permitted prefix, then passes the entire plural-forms field to the Function constructor, allowing a malicious suffix to execute. Exploitation requires control of a loaded definition catalog and exposes data and actions available to the consuming JavaScript context.

The record

CVE
CVE-2024-43370
Published
Aug 15, 2024
Updated
Aug 16, 2024
Vendor
guillaumepotier
Product
gettext.js
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 16, 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=< 2.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

guillaumepotier · gettext.jsversion=< 2.0.3

Published CVSS scores

7.2GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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