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9.1
CVE-2026-48188: OTRS and related products allow unauthenticated login bypass
CVE-2026-48188 · published 4 months ago
Summary
Versions of OTRS, OTRS Community Edition, and related packages such as Debian's Znuny and Canonical's OTRS2 can be tricked into bypassing login checks if the database is set to a special mode. This happens because the software does not properly check input before sending commands to the database. Apply the latest updates for the affected versions or change the MySQL/MariaDB setting to disable the NO_BACKSLASH_ESCAPES mode to protect your system.
What to do
- Update debian znuny to version 6.5.25-1.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Debian:12 | debian | znuny | All versions |
| Debian:14 | debian | znuny |
< 6.5.25-1 Fix: upgrade to 6.5.25-1
|
| Ubuntu:16.04:LTS | canonical | otrs2 | All versions |
| Ubuntu:24.04:LTS | canonical | znuny | All versions |
| – | otrs | otrs |
<= 6.0.32 >= 7.0.0, <= 8.0.37 >= 2023.0.0, < 2026.4.1 cpe:2.3:a:otrs:otrs:*:*:*:*:community:*:*:* |
Original advisory text
An improper Input Validation vulnerability in OTRS or ((OTRS)) Community Edition database layer module allows an unauthenticated SQL injection which can lead to an authentication bypass. This issue...
An improper Input Validation vulnerability in OTRS or ((OTRS)) Community Edition database layer module allows an unauthenticated SQL injection which can lead to an authentication bypass. This issue only affects the system if the MySQL/MariaDB server is configured with the NO_BACKSLASH_ESCAPES SQL mode. This issue affects OTRS: * 7.0.X * 8.0.X * 2023.X * 2024.X * 2025.X * 2026.X before 2026.4.X * (OTRS)) Community Edition: 6.0.x Products based on the ((OTRS)) Community Edition also very likely to be affected
References
- https://otrs.com/release-notes/otrs-security-advisory-2026-02/ Vendor Advisory
- https://security-tracker.debian.org/tracker/CVE-2026-48188 Vendor Advisory
- https://ubuntu.com/security/CVE-2026-48188 Third Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2026-48188 Third Party Advisory
- https://www.znuny.org/en/advisories/zsa-2026-13 Third Party Advisory
Internet-facing
3 days
Internal
60 days
- Not known to be exploited
- Can be exploited automatically
- Gives an attacker full control
Type
CWE-20Improper Input Validation
Timeline
Published1 Jun 2026
Updated11 Oct 2026
First seen1 Jun 2026
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