Webserver abort via unbounded email resource allocation
Published Jun 1, 2026 · Updated Jun 1, 2026
Resource exhaustion in the OTRS Mail Backend allows remote authenticated users to abort the webserver through email handling. The Mail Backend allocates resources for special email content without limits or throttling, but OTRS has not disclosed the exact function or content pattern. Low privileges and user interaction are required, and successful exploitation interrupts availability by terminating the webserver without reading or modifying data.
Summary
What happened
Resource exhaustion in the OTRS Mail Backend allows remote authenticated users to abort the webserver through email handling. The Mail Backend allocates resources for special email content without limits or throttling, but OTRS has not disclosed the exact function or content pattern. Low privileges and user interaction are required, and successful exploitation interrupts availability by terminating the webserver without reading or modifying data.
The record
- CVE
- CVE-2026-48187
- Published
- Jun 1, 2026
- Updated
- Jun 1, 2026
- Vendor
- Centuran Consulting
- Product
- OTRS
- Classifications
- CWE-400, CWE-770, CAPEC-130, T1499.003
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 1, 2026CVE publishedPublication date reported by the CVE source.
- Jun 1, 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.
- Affected versionversion=2023.x
- Affected versionversion=2024.x
- Affected versionversion=2025.x
- Affected versionversion=2026.x <=2026.3.x
- Affected versionversion=8.0.x
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
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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