CVE-2026-9806Network attack vector

Stored script execution via unsanitized convert names

Published May 28, 2026 · Updated May 28, 2026

Stored XSS in MISP cti-transmute's development-branch notification panel allows remote attackers to execute JavaScript through convert names. The bell dropdown inserts notification text containing an untrusted convert name with innerHTML, so browser parsing turns injected markup into executable script. An attacker must control a convert name and wait for an authenticated user to open the panel, exposing that user's application data and session actions.

CVSS severity6.3
Medium
EPSS probability0.26%
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 MISP cti-transmute's development-branch notification panel allows remote attackers to execute JavaScript through convert names. The bell dropdown inserts notification text containing an untrusted convert name with innerHTML, so browser parsing turns injected markup into executable script. An attacker must control a convert name and wait for an authenticated user to open the panel, exposing that user's application data and session actions.

The record

CVE
CVE-2026-9806
Published
May 28, 2026
Updated
May 28, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.3CIRCLCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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