CVE-2026-48187: An uncontrolled allocation of resources without limits or throttling in the e-mail handling in OTRS allows exc

Routine

MEDIUM 5.7UPGRADE

CVE-2026-48187 is a medium-severity flaw (CVSS 5.7) affecting otrs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.7 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.2% (top 90%)
CISA exploited list	No
Weakness	CWE-400, CWE-770
Published	2026-06-01
Last modified	2026-07-22

Publisher (CNA): OTRS AG · Vendor: otrs

Last updated 2026-07-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-01 04:16 UTCPublished CVE record published
2026-07-22 07:10 UTCUpdated Record last modified

otrs otrs UPGRADE

Affected: <= 6.0.32 · >= 7.0.0 and <= 8.0.37 · >= 2023.0.0 and < 2026.4.1

Fixed in: 2026.4.1

Safe to downgrade to: a release before 7.0.0

1. Check installed version

apt-cache policy otrs || rpm -q otrs || otrs --version

2. UPGRADE to 2026.4.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade otrs

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade otrs

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 7.0.0 (Debian / Ubuntu)

apt-cache madison otrs sudo apt install otrs=<VERSION_BEFORE_7.0.0> sudo apt-mark hold otrs

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list otrs sudo dnf downgrade otrs-<VERSION_BEFORE_7.0.0> sudo dnf versionlock add otrs

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-48187?

otrs: upgrade to 2026.4.1. Exact commands for each OS are on this page.

Is CVE-2026-48187 being exploited?

CVE-2026-48187 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-48187 affect?

CVE-2026-48187 affects otrs. Severity is medium (CVSS 5.7). 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 *

How urgent is CVE-2026-48187?

Priority 22/100. No elevated risk signals yet.

Related CVEs

CVE-2026-48188 CRITICAL 9.1 UPGRADE An improper Input Validation vulnerability in OTRS or ((OTRS)) Community Edition database layer module allows
CVE-2026-48208 MEDIUM 6.5 UPGRADE An improper neutralization of active SVG content in OTRS or ((OTRS)) Community Edition ticket article renderin
CVE-2026-48209 HIGH 7.1 UPGRADE An improper neutralization of user-controllable input in OTRS or ((OTRS)) Community Edition ticket handling al
CVE-2026-48210 MEDIUM 5.7 DOWNGRADE An improper default configuration in OTRS 2026.3.1 causes ticket article forwarding actions to enforce the “Is
CVE-2026-48189 MEDIUM 5.7 UPGRADE An improper Input Validation vulnerability in OTRS Customer Backend module allows to access customer informati

References

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