CVE-2026-26483Network attack vector

Stored XSS via unsanitized template content

Published Jul 20, 2026 · Updated Jul 20, 2026

Stored XSS in Mettle SendPortal 3.0.1 and earlier allows remote attackers to execute JavaScript when a user opens an affected template. The /templates endpoint stores the unsanitized content parameter, and the template view later renders that attacker-controlled value in a user's browser. Exploitation requires a user to access the affected template and exposes that browser session to attacker-controlled script execution.

CVSS severityUnavailable
Unscored
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 Mettle SendPortal 3.0.1 and earlier allows remote attackers to execute JavaScript when a user opens an affected template. The /templates endpoint stores the unsanitized content parameter, and the template view later renders that attacker-controlled value in a user's browser. Exploitation requires a user to access the affected template and exposes that browser session to attacker-controlled script execution.

The record

CVE
CVE-2026-26483
Published
Jul 20, 2026
Updated
Jul 20, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 20, 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

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.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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