CVE-2026-81754Network attack vector

Stored XSS via incomplete audit-log attribute escaping

Published Sep 11, 2026 · Updated Sep 11, 2026

Stored XSS in Vigilant 2.10.2 and earlier allows remote attackers to execute script in an administrator's browser through a crafted User-Agent. Vigilant stores the header on a failed login, then its Security Audit UI encodes angle brackets but not quotes before placing the value in an HTML attribute. No account is needed to plant the payload, but an administrator must view or refresh the affected audit entry for the script to run with that browser session's privileges.

CVSS severityUnavailable
Unscored
EPSS probability0.24%
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 Vigilant 2.10.2 and earlier allows remote attackers to execute script in an administrator's browser through a crafted User-Agent. Vigilant stores the header on a failed login, then its Security Audit UI encodes angle brackets but not quotes before placing the value in an HTML attribute. No account is needed to plant the payload, but an administrator must view or refresh the affected audit entry for the script to run with that browser session's privileges.

The record

CVE
CVE-2026-81754
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
Fernando Tellado
Product
Vigilant
Classifications
T1059.007
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 <=2.10.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Fernando Tellado · Vigilantversion=0 <=2.10.2

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

T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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