CVE-2024-2840Network attack vector

Stored script execution via permitted DFXP uploads

Published May 2, 2024 · Updated Apr 8, 2026

Stored cross-site scripting in Web Bistro Enhanced Media Library 2.8.9 and earlier allows remote authenticated users to inject scripts. The media upload MIME-type allowlist accepts DFXP subtitle files without blocking embedded script content, so uploaded payloads persist in published pages. Author-level access is required to upload the file, and execution occurs only when another user visits affected content, exposing that user's browser session to script actions.

CVSS severity5.4
Medium
EPSS probability0.39%
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 Web Bistro Enhanced Media Library 2.8.9 and earlier allows remote authenticated users to inject scripts. The media upload MIME-type allowlist accepts DFXP subtitle files without blocking embedded script content, so uploaded payloads persist in published pages. Author-level access is required to upload the file, and execution occurs only when another user visits affected content, exposing that user's browser session to script actions.

The record

CVE
CVE-2024-2840
Published
May 2, 2024
Updated
Apr 8, 2026
Vendor
Web Bistro
Product
Enhanced Media Library
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 2, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 2026Record 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=0 <=2.8.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Web Bistro · Enhanced Media Libraryversion=0 <=2.8.9

Published CVSS scores

5.4WordfenceCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')
T1059.007Command and Scripting Interpreter: JavaScript

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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