CVE-2024-39126Network attack vector

Stored XSS via active document attachments

Published Jul 17, 2024 · Updated Mar 13, 2025

Stored cross-site scripting in Roundup before 2.4.0 allows remote authenticated users to execute JavaScript via crafted attachments. The attachment-serving path rendered attacker-controlled PDF, XML, and SVG content in the browser without controls that blocked embedded scripts. An attacker must be able to attach a document and persuade another user to open it, enabling script execution in that user's Roundup origin.

CVSS severity5.4
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Roundup before 2.4.0 allows remote authenticated users to execute JavaScript via crafted attachments. The attachment-serving path rendered attacker-controlled PDF, XML, and SVG content in the browser without controls that blocked embedded scripts. An attacker must be able to attach a document and persuade another user to open it, enabling script execution in that user's Roundup origin.

The record

CVE
CVE-2024-39126
Published
Jul 17, 2024
Updated
Mar 13, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1204.002
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 17, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 13, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.002User Execution: Malicious File

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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