CVE-2025-21610Public exploitNetwork attack vector

Session data disclosure via unvalidated link URL

Published Jan 3, 2025 · Updated Jan 3, 2025

Cross-site scripting in 37signals Trix before 2.1.12 allows remote attackers to run JavaScript through a crafted link URL. ToolbarController.setAttribute accepts a javascript: href from the link dialog without validating it as a safe anchor attribute. Exploitation requires a user to enter the URL and activate the resulting link, exposing data available in the user's session.

CVSS severity5.3
Medium
EPSS probability0.42%
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 37signals Trix before 2.1.12 allows remote attackers to run JavaScript through a crafted link URL. ToolbarController.setAttribute accepts a javascript: href from the link dialog without validating it as a safe anchor attribute. Exploitation requires a user to enter the URL and activate the resulting link, exposing data available in the user's session.

The record

CVE
CVE-2025-21610
Published
Jan 3, 2025
Updated
Jan 3, 2025
Vendor
37signals
Product
Trix
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Jan 3, 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=< 2.1.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

37signals · Trixversion=< 2.1.12

Published CVSS scores

5.3GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/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.

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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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001Malicious Link

Public exploit references

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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