CVE-2026-90443Network attack vectorHinoki check available

Session-privileged script execution via reflected request URL

Published Sep 11, 2026 · Updated Sep 11, 2026

Cross-site scripting in Malcolm before 26.06.0 allows remote attackers to execute script through a crafted unauthenticated URL. The web interface inserts part of the request URL into a script context and a hyperlink attribute without context-appropriate encoding. A user must visit the crafted link; the script runs with that user's application session privileges and can redirect the browser externally.

CVSS severityUnavailable
Unscored
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Cross-site scripting in Malcolm before 26.06.0 allows remote attackers to execute script through a crafted unauthenticated URL. The web interface inserts part of the request URL into a script context and a hyperlink attribute without context-appropriate encoding. A user must visit the crafted link; the script runs with that user's application session privileges and can redirect the browser externally.

The record

CVE
CVE-2026-90443
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
Cybersecurity and Infrastructure Security Agency (CISA)
Product
Malcolm
Classifications
T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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 <v26.06.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cybersecurity and Infrastructure Security Agency (CISA) · Malcolmversion=0 <v26.06.0

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.

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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

T1204.001User Execution: Malicious Link

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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