CVE-2026-56731Network attack vectorHinoki check available

Stored XSS via unsanitized ticket titles

Published Sep 25, 2026 · Updated Sep 25, 2026

Stored cross-site scripting in Zammad before 7.0.1 allows remote authenticated users to run JavaScript through a crafted ticket title. The standard ticket-creation workflow persists arbitrary HTML in the title without removing JavaScript event-handler attributes before rendering it. A low-privilege account is sufficient, and execution occurs in another user's browser when affected ticket-title content is displayed.

CVSS severityUnavailable
Unscored
EPSS probability0.24%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored cross-site scripting in Zammad before 7.0.1 allows remote authenticated users to run JavaScript through a crafted ticket title. The standard ticket-creation workflow persists arbitrary HTML in the title without removing JavaScript event-handler attributes before rendering it. A low-privilege account is sufficient, and execution occurs in another user's browser when affected ticket-title content is displayed.

The record

CVE
CVE-2026-56731
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
Zammad GmbH
Product
Zammad
Classifications
T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 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=< 7.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Zammad GmbH · Zammadversion=< 7.0.1

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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