CVE-2024-39910Network attack vector

Stored XSS via unsanitized Quill editor values

Published Sep 16, 2024 · Updated Sep 16, 2024

Stored cross-site scripting in Decidim before 0.27.7 allows remote authenticated users to execute script in an administrator's browser. The FormBuilder editor passed a persisted field value directly into its hidden field, allowing QuillJS to render attacker-modified HTML without the admin sanitizer added by the patch. Admin-panel or participatory-space administrator access is required to store the payload, and another user must render the editor content before browser-accessible data can be disclosed.

CVSS severity5.4
Medium
EPSS probability0.27%
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 Decidim before 0.27.7 allows remote authenticated users to execute script in an administrator's browser. The FormBuilder editor passed a persisted field value directly into its hidden field, allowing QuillJS to render attacker-modified HTML without the admin sanitizer added by the patch. Admin-panel or participatory-space administrator access is required to store the payload, and another user must render the editor content before browser-accessible data can be disclosed.

The record

CVE
CVE-2024-39910
Published
Sep 16, 2024
Updated
Sep 16, 2024
Vendor
Decidim
Product
Decidim
Classifications
CWE-79, T1203
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 16, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 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=< 0.27.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Decidim · Decidimversion=< 0.27.7

Published CVSS scores

5.4GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N
4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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