CVE-2026-73490Network attack vector

Script execution via unrestricted SVG href references

Published Aug 12, 2026 · Updated Aug 12, 2026

Cross-site scripting in Loofah before 2.25.2 allows remote attackers to execute script through sanitized user-supplied SVG content. The HTML5 sanitizer checks xlink:href but not the equivalent plain href attribute on SVG use and feImage elements, leaving external references intact. Exploitation requires the default SVG allowlist and user rendering; same-origin use can run referenced script, while feImage can track viewers.

CVSS severity4.7
Medium
EPSS probability0.18%
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 Loofah before 2.25.2 allows remote attackers to execute script through sanitized user-supplied SVG content. The HTML5 sanitizer checks xlink:href but not the equivalent plain href attribute on SVG use and feImage elements, leaving external references intact. Exploitation requires the default SVG allowlist and user rendering; same-origin use can run referenced script, while feImage can track viewers.

The record

CVE
CVE-2026-73490
Published
Aug 12, 2026
Updated
Aug 12, 2026
Vendor
flavorjones
Product
Loofah
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 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=< 2.25.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

flavorjones · Loofahversion=< 2.25.2

Published CVSS scores

4.7GitHubCVSS:3.1/AV:N/AC:H/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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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