CVE-2025-2361Public exploitNetwork attack vector

Browser script execution via cmd CRLF injection

Published Mar 17, 2025 · Updated Mar 27, 2025

Cross-site scripting in Mercurial hgweb before 6.9.4 allows remote attackers to run JavaScript in a target browser via a crafted link. The web interface accepts CRLF characters in the cmd request value and incorporates the resulting text into an HTTP response without rejecting the injected line break. No authentication is required, but a user must open the link; WSGI layers such as mod_wsgi can reject the malformed response instead.

CVSS severity4.3
Medium
EPSS probability0.51%
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 Mercurial hgweb before 6.9.4 allows remote attackers to run JavaScript in a target browser via a crafted link. The web interface accepts CRLF characters in the cmd request value and incorporates the resulting text into an HTTP response without rejecting the injected line break. No authentication is required, but a user must open the link; WSGI layers such as mod_wsgi can reject the malformed response instead.

The record

CVE
CVE-2025-2361
Published
Mar 17, 2025
Updated
Mar 27, 2025
Vendor
Mercurial
Product
Mercurial
Classifications
CWE-79, CWE-94, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 17, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 27, 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=4.5.3
  2. Affected versionversion=71.19.145.211

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mercurial · Mercurialversion=4.5.3; version=71.19.145.211

Published CVSS scores

4.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
5.0VulDBAV:N/AC:L/Au:N/C:N/I:P/A:N
5.3VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-94Improper Control of Generation of Code ('Code Injection')
T1204.001Malicious Link

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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