CVE-2026-73374Network attack vector

Stored XSS via unescaped CNA reference tags

Published Aug 12, 2026 · Updated Aug 12, 2026

Stored XSS in Vulnerability-Lookup 5.5.1 and earlier allows remote authenticated users to execute script in a viewer's browser. The render_tag_badges filter interpolates CNA reference tags into badge HTML and wraps the result in Markup without escaping each tag. A user holding vulnerability:create or vulnerability:modify permission must store a crafted tag, which executes when another user opens its public vulnerability page.

CVSS severity6.1
Medium
EPSS probability0.36%
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 Vulnerability-Lookup 5.5.1 and earlier allows remote authenticated users to execute script in a viewer's browser. The render_tag_badges filter interpolates CNA reference tags into badge HTML and wraps the result in Markup without escaping each tag. A user holding vulnerability:create or vulnerability:modify permission must store a crafted tag, which executes when another user opens its public vulnerability page.

The record

CVE
CVE-2026-73374
Published
Aug 12, 2026
Updated
Aug 12, 2026
Vendor
Computer Incident Response Center Luxembourg (CIRCL)
Product
Vulnerability-Lookup
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

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=0 <=5.5.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Computer Incident Response Center Luxembourg (CIRCL) · Vulnerability-Lookupversion=0 <=5.5.1

Published CVSS scores

6.1CIRCLCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:H/SI:N/SA: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')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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