CVE-2026-48187 Email with special content can lead to DoS
An attacker can cause a denial of service by sending specially crafted emails that trigger excessive resource allocation in OTRS.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-48187?
CVE-2026-48187 is a medium-severity denial of service vulnerability in Otrs Otrs, published on 1 Jun 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
An uncontrolled allocation of resources without limits or throttling in the e-mail handling in OTRS allows excessive allocation which may lead to the abortion of the webserver.This issue affects OTRS:
* 8.0.X * 2023.X * 2024.X * 2025.X * 2026.X before 2026.4.X
Please note that ((OTRS)) Community Edition 6.x, OTRS 7.x and products based on the ((OTRS)) Community Edition also very likely to be affected
Which versions are affected by CVE-2026-48187?
It affects 1 product.
Products include Otrs Otrs.
How do I fix CVE-2026-48187?
No fix has been published for CVE-2026-48187 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-48187 being exploited?
There is no known exploitation of CVE-2026-48187 in the wild and no public exploit code.
Other vulnerabilities in Otrs Otrs
Sources
Also known as GHSA-v95g-89m8-9p9r.