CVE-2023-40030Public exploitNetwork attack vector

Cross-site scripting via unescaped feature names

Published Aug 24, 2023 · Updated Sep 30, 2024

Cross-site scripting in Rust Project Cargo 1.60.0 and later, before 1.72, allows attackers to execute JavaScript via timing reports. The cargo build --timings renderer writes dependency feature names into generated HTML without escaping them, so a crafted name becomes executable markup. Exposure requires a git, local-path, or alternative-registry dependency and a user to upload and view the report on a credentialed domain; crates.io-only dependencies are unaffected.

CVSS severity6.1
Medium
EPSS probability0.90%
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 Rust Project Cargo 1.60.0 and later, before 1.72, allows attackers to execute JavaScript via timing reports. The cargo build --timings renderer writes dependency feature names into generated HTML without escaping them, so a crafted name becomes executable markup. Exposure requires a git, local-path, or alternative-registry dependency and a user to upload and view the report on a credentialed domain; crates.io-only dependencies are unaffected.

The record

CVE
CVE-2023-40030
Published
Aug 24, 2023
Updated
Sep 30, 2024
Vendor
Rust Project
Product
Cargo
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 24, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 30, 2024Record 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=>= 1.60.0, < 1.72

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Rust Project · Cargoversion=>= 1.60.0, < 1.72

Published CVSS scores

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 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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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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