CVE-2025-27823Network attack vector

Stored XSS via unvalidated link data attribute

Published Mar 7, 2025 · Updated Mar 7, 2025

Stored XSS in Backdrop CMS Mail Disguise before 1.x-1.0.5 allows remote authenticated users to execute script through crafted links. The module accepts a link's data attribute without sufficient validation when it processes anchor elements in page content. The attacker must be able to insert anchor HTML with data attributes, and successful payloads execute in visitors' browser contexts.

CVSS severity7.2
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Backdrop CMS Mail Disguise before 1.x-1.0.5 allows remote authenticated users to execute script through crafted links. The module accepts a link's data attribute without sufficient validation when it processes anchor elements in page content. The attacker must be able to insert anchor HTML with data attributes, and successful payloads execute in visitors' browser contexts.

The record

CVE
CVE-2025-27823
Published
Mar 7, 2025
Updated
Mar 7, 2025
Vendor
Backdrop CMS
Product
Mail Disguise
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 7, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.x-1.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Backdrop CMS · Mail Disguiseversion=0 <1.x-1.0.5

Published CVSS scores

7.2MITRECVSS:3.1/AV:N/AC:L/PR:L/UI:N/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')
T1059.007JavaScript

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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