CVE-2025-31687Network attack vector

Cross-site scripting via unsanitized HTML data attributes

Published Mar 31, 2025 · Updated Apr 29, 2025

Cross-site scripting in Drupal SpamSpan filter before 3.2.1 allows remote attackers to execute JavaScript via crafted email-link attributes. The filter preserves untrusted HTML data attributes while converting an email link into span elements, and its JavaScript later reconstructs the link without sanitizing those attributes. Exploitation requires permission or another path to place crafted span elements in filtered page content and a user to view it, enabling script execution in that user's browser context.

CVSS severity6.1
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Drupal SpamSpan filter before 3.2.1 allows remote attackers to execute JavaScript via crafted email-link attributes. The filter preserves untrusted HTML data attributes while converting an email link into span elements, and its JavaScript later reconstructs the link without sanitizing those attributes. Exploitation requires permission or another path to place crafted span elements in filtered page content and a user to view it, enabling script execution in that user's browser context.

The record

CVE
CVE-2025-31687
Published
Mar 31, 2025
Updated
Apr 29, 2025
Vendor
OAuth.js
Product
SpamSpan filter
Classifications
CWE-79, CAPEC-63
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 31, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 29, 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=0.0.0 <3.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OAuth.js · SpamSpan filterversion=0.0.0 <3.2.1

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-63Cross-Site Scripting (XSS)

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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