CVE-2026-93582Network attack vectorHinoki check available

Authentication bypass via spoofed Remote-User header

Published Oct 12, 2026 · Updated Oct 12, 2026

Authentication bypass in ((OTRS)) Community Edition 6 and earlier allows remote attackers to impersonate users via a Remote-User header. The HTTPBasicAuth modules trust HTTP_REMOTE_USER as an authenticated username without password verification when CGI or mod_perl maps the supplied header into that environment variable. Exploitation requires the HTTP Basic Authentication backend and a reachable Generic Interface without effective upstream authentication; access to confidential information and modification of data or configuration are limited to the impersonated account's permissions.

CVSS severityUnavailable
Unscored
EPSS probability0.39%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Authentication bypass in ((OTRS)) Community Edition 6 and earlier allows remote attackers to impersonate users via a Remote-User header. The HTTPBasicAuth modules trust HTTP_REMOTE_USER as an authenticated username without password verification when CGI or mod_perl maps the supplied header into that environment variable. Exploitation requires the HTTP Basic Authentication backend and a reachable Generic Interface without effective upstream authentication; access to confidential information and modification of data or configuration are limited to the impersonated account's permissions.

The record

CVE
CVE-2026-93582
Published
Oct 12, 2026
Updated
Oct 12, 2026
Vendor
OTRS GmbH
Product
((OTRS)) Community Edition
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 12, 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=6.x

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OTRS GmbH · ((OTRS)) Community Editionversion=6.x

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

T1190Exploit Public-Facing Application

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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