CVE-2025-71310Network attack vector

Stored XSS via unsanitized YouTube Info content

Published May 26, 2026 · Updated May 26, 2026

Stored cross-site scripting in Backdrop CMS GDPR Cookies before 1.x-1.3.5 allows remote authenticated users to execute script in visitors' browsers. The YouTube service's optional Info content field accepts malicious markup without sufficient neutralization and later renders it to site visitors. Exploitation requires permission to create or edit GDPR Cookies services, a configured YouTube service, and a visitor who loads the affected output.

CVSS severity1.8
Low
EPSS probability0.26%
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 Backdrop CMS GDPR Cookies before 1.x-1.3.5 allows remote authenticated users to execute script in visitors' browsers. The YouTube service's optional Info content field accepts malicious markup without sufficient neutralization and later renders it to site visitors. Exploitation requires permission to create or edit GDPR Cookies services, a configured YouTube service, and a visitor who loads the affected output.

The record

CVE
CVE-2025-71310
Published
May 26, 2026
Updated
May 26, 2026
Vendor
Backdrop CMS
Product
GDPR Cookies
Classifications
CWE-80, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 26, 2026CVE publishedPublication date reported by the CVE source.
  2. May 26, 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 <1.x-1.3.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Backdrop CMS · GDPR Cookiesversion=0 <1.x-1.3.5

Published CVSS scores

1.8MITRECVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:L

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-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
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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