CVE-2026-12755: Improper input validation in the PAM AD discovery endpoints in Devolutions Server 2026.2.4.0 through 2026.2.7

Routine

LOW 2.7UPGRADE

CVE-2026-12755 is a low-severity flaw (CVSS 2.7) affecting devolutions server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper input validation in the PAM AD discovery endpoints in Devolutions Server 2026.2.4.0 through 2026.2.7.0 allows an authenticated user with the UserGroupsView permission to coerce server-side authentication to an attacker-controlled host, exposing PAM provider credentials as a NTLMv2 challenge-response, via a crafted DomainName parameter.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	2.7 (Low)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.4% (top 70%)
CISA exploited list	No
Weakness	CWE-1284
Published	2026-06-25
Last modified	2026-10-25

Publisher (CNA): Devolutions Inc. · Vendor: devolutions

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-25 14:16 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

devolutions devolutions server UPGRADE

Affected: >= 2026.2.4.0 and < 2026.2.9.0

Fixed in: 2026.2.9.0

Safe to downgrade to: a release before 2026.2.4.0

1. Check installed version

apt-cache policy devolutions-server || rpm -q devolutions-server || devolutions-server --version

2. UPGRADE to 2026.2.9.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade devolutions-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade devolutions-server

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 2026.2.4.0 (Debian / Ubuntu)

apt-cache madison devolutions-server sudo apt install devolutions-server=<VERSION_BEFORE_2026.2.4.0> sudo apt-mark hold devolutions-server

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

dnf --showduplicates list devolutions-server sudo dnf downgrade devolutions-server-<VERSION_BEFORE_2026.2.4.0> sudo dnf versionlock add devolutions-server

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-2026-12755?

devolutions server: upgrade to 2026.2.9.0. Exact commands for each OS are on this page.

Is CVE-2026-12755 being exploited?

CVE-2026-12755 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-2026-12755 affect?

CVE-2026-12755 affects devolutions server. Severity is low (CVSS 2.7). Improper input validation in the PAM AD discovery endpoints in Devolutions Server 2026.2.4.0 through 2026.2.7.0 allows an authenticated user with the UserGroupsView permission to coerce server-side authentication to an attacker-controlle

How urgent is CVE-2026-12755?

Priority 17/100. No elevated risk signals yet.

Related CVEs

CVE-2026-4924 HIGH 8.2 UPGRADE Improper authentication in the two-factor authentication (2FA) feature in Devolutions Server 2026.1.11 and e
CVE-2026-8407 MEDIUM 4.3 UPGRADE Missing authorization in the PAM module in Devolutions Server allows an authenticated user with a PAM license
CVE-2026-12105 MEDIUM 6.5 UPGRADE Improper access control in Devolutions Server 2026.2.5, 2026.1.21 allows an authenticated user to access atta
CVE-2026-11890 MEDIUM 4.3 UPGRADE Improper access control in PAM account discovery results in Devolutions Server 2026.2.5, 2026.1.21 allows an
CVE-2026-12117 MEDIUM 4.3 UPGRADE Improper access control in the social login connection endpoint in Devolutions Server 2026.2.5 allows an auth

References

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