Which versions of plasma-login-manager are affected by CVE-2026-25710?

KDE Plasma's login manager contains a privilege escalation vulnerability allowing authenticated local users to achieve complete system control.

How to fix or mitigate CVE-2026-25710?

Within 24 hours: Enumerate all KDE Plasma systems with graphical login enabled; document plasmaloginauthhelper component versions and the number of local authenticated users with GUI access. Within 7 days: Restrict graphical login to essential authenticated users only; apply SELinux or AppArmor policies to constrain plasmaloginauthhelper process capabilities; disable graphical login on systems not requiring it operationally. Within 30 days: Establish monitoring of KDE upstream security advisories; develop and test an expedited patch deployment plan for KDE Plasma components executable within 24 hours of vendor release; stage and test alternative login managers (LightDM, GDM, SDDM) for rapid deployment if patches are delayed.

plasma-login-manager CVE-2026-25710

Q: What is the CVSS score of CVE-2026-25710?

CVE-2026-25710 has a CVSS 4.0 base score of 7.0 (High). CVSS vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.0%.

EUVD-2026-29919 HIGH

Execution with Unnecessary Privileges (CWE-250)

2026-04-27

GHSA-wv98-2g94-x84x

Privilege Escalation

7.0

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

7.0 HIGH

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

vuln.today AI

7.3 HIGH

Local authenticated user (AV:L/PR:L) leverages an over-privileged helper with passive interaction (UI:R) to gain full host compromise (C/I/A:H); scope unchanged as impact stays on the same system.

3.1 AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

4.0 AV:L/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

SUSE

4.0 MEDIUM

qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

Scope

Lifecycle Timeline

Analysis Generated

Jul 24, 2026 - 02:01 vuln.today

CVE Published

Apr 27, 2026 - 10:45 oss-security

HIGH 7.0

CVE Published

Apr 27, 2026 - 10:45 nvd

N/A

Description PRE-NVD

Disclosed via oss-security. NVD scoring and full description are pending.

AnalysisAI

Local privilege escalation in KDE's plasma-login-manager arises from its plasmaloginauthhelper component executing with unnecessary elevated privileges (CWE-250), allowing an authenticated local user with a graphical session to obtain full compromise of confidentiality, integrity, and availability. Disclosed via oss-security on 2026-04-27 by SUSE's Matthias Gerstner and tracked as EUVD-2026-29919, the weakness affects the privileged authentication helper backing the login manager. No public exploit identified at time of analysis, and EPSS is very low (0.01%), consistent with a local-only, interaction-dependent flaw rather than a mass-exploitation candidate.

Technical ContextAI

plasma-login-manager is KDE's Plasma-based display/login manager; plasmaloginauthhelper is the privileged backend helper that performs authentication and session-setup actions on behalf of the unprivileged greeter/UI. The root cause is CWE-250 (Execution with Unnecessary Privileges): the helper runs with more privilege than required (typically root), so weaknesses in how it validates its callers or handles inputs let a low-privileged local user leverage that privilege boundary. Because the CVSS 4.0 vector is AV:L/AC:L/AT:N/PR:L/UI:P with VC/VI/VA all High and no subsequent-system impact (SC/SI/SA:N), the flaw is a contained local escalation on the affected host rather than a remote or lateral-movement vector. Exact affected version boundaries are not enumerated in NVD/EUVD beyond an open-ended range.

RemediationAI

Apply the distribution-provided update for plasma-login-manager once available; the openSUSE advisory references an upstream bugfix (https://security.opensuse.org/2026/04/27/plasma-login-manager.html#6-upstream-bugfix), so update to the patched package published by your distribution - no vendor-released fixed version string was included in the provided data, so confirm the exact release via that advisory and https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-25710. Patch status: upstream bugfix referenced by the vendor advisory; a specific patched version was not independently confirmed from the input. As compensating controls until patched, restrict local/interactive login on affected hosts to trusted users (this reduces exposure but harms multi-user usability), and on systems where an alternative display manager is acceptable, switch the greeter to SDDM/GDM to avoid the vulnerable plasmaloginauthhelper path (trade-off: reconfiguration and loss of Plasma-specific login integration). Monitor the oss-security thread (https://www.openwall.com/lists/oss-security/2026/04/27) for the confirmed fixed version.