CVE-2026-90981Network attack vectorHinoki check available

Administrator-targeted script execution via unescaped nn parameter

Published Sep 18, 2026 · Updated Sep 18, 2026

Reflected XSS in Satollo Newsletter 9.3.8 and earlier allows remote attackers to inject scripts through the nn request parameter. The dienow() output branch places the unsanitized nn value in an administrator-visible spam-reason message without output escaping. Execution requires a logged-in administrator to follow a crafted link because authentication passes the antibot check; the script then runs in that administrator's browser context.

CVSS severityUnavailable
Unscored
EPSS probability0.38%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Reflected XSS in Satollo Newsletter 9.3.8 and earlier allows remote attackers to inject scripts through the nn request parameter. The dienow() output branch places the unsanitized nn value in an administrator-visible spam-reason message without output escaping. Execution requires a logged-in administrator to follow a crafted link because authentication passes the antibot check; the script then runs in that administrator's browser context.

The record

CVE
CVE-2026-90981
Published
Sep 18, 2026
Updated
Sep 18, 2026
Vendor
Satollo
Product
Newsletter
Classifications
T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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 <=9.3.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Satollo · Newsletterversion=0 <=9.3.8

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1204.001Malicious 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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