On a multi-user system, a user with an active local login session could downgrade a system-wide Flatpak app to an older version by removing the app's remote ref via the unprivileged system-helper RemoveLocalRef method, causing the anti-downgrade check to fail to find a reference date. A malicious local user could use this to expose other users of the same system to an app version with unfixed vulnerabilities.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:5127-1 advisory.

    - CVE-2026-34078: Arbitrary code execution via crafted symlinks in sandbox-expose options (bsc#1261769).
    - CVE-2026-34079: Arbitrary file deletion on host via improper cache file path validation (bsc#1261770).
    - CVE-2026-90616: missing symlink protection allows a malicious sandboxed app to obtain arbitrary read and     write access       to files on the host (bsc#1280236).
    - CVE-2026-92162: path traversal via unvalidated `arch` parameter in `DeployAppstream` (bsc#1282514).
    - CVE-2026-96275: arbitrary write access as root via extra-data extraction (bsc#1282515).
    - CVE-2026-96276: arbitrary write in host context via `flatpak build-init` (bsc#1282516).
    - CVE-2026-96280: buffer overflow in OCI delta stream path names (bsc#1282518).
    - CVE-2026-96281: unprivileged active user can bypass anti-downgrade checks for system apps/runtimes     (bsc#1282519).
    - CVE-2026-96282: extension metadata path traversal file existence oracle (bsc#1282520).
    - CVE-2026-96807: fixed-filename writes to arbitrary locations via symlink attack on `.ld.so`     (bsc#1282523).
    - CVE-2026-96808: `revokefs` symlink path traversal allows local privilege escalation via commit tampering       (bsc#1282524).

    Changes for flatpak:

    - Update to version 1.16.6 (jsc#PED-17048):
     + Fix file descriptor leaks affecting Chromium-based browsers.
     + Fix installing extra-data without a runtime, including OpenH264.
     + Ignore unusable sandbox-expose paths for portal sub-sandboxes,      fixing Epiphany regressions.
     + Fix installed tests and handling of standard file descriptors      passed as invalid flatpak run arguments.
    - Switch from Autotools to Meson, preserving system bubblewrap,      xdg-dbus-proxy, curl and distribution-specific installation paths.
    - Require bubblewrap >= 0.10.0 and GPGME >= 1.8.0; add Meson,      gettext, gtk-doc and polkit-agent build dependencies and drop      obsolete intltool and libelf build dependencies.
    - Generate the system-user pre-script from the Meson build directory      and package the tmpfiles configuration and renamed manual pages.

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4944-1 advisory.

    - CVE-2026-90616: missing symlink protection allows a malicious sandboxed app to obtain arbitrary read and     write access       to files on the host (bsc#1280236).
    - CVE-2026-92162: path traversal via unvalidated `arch` parameter in `DeployAppstream` (bsc#1282514).
    - CVE-2026-96275: arbitrary write access as root via extra-data extraction (bsc#1282515).
    - CVE-2026-96276: arbitrary write in host context via `flatpak build-init` (bsc#1282516).
    - CVE-2026-96280: buffer overflow in OCI delta stream path names (bsc#1282518).
    - CVE-2026-96281: unprivileged active user can bypass anti-downgrade checks for system apps/runtimes     (bsc#1282519).
    - CVE-2026-96282: extension metadata path traversal file existence oracle (bsc#1282520).
    - CVE-2026-96807: fixed-filename writes to arbitrary locations via symlink attack on `.ld.so`     (bsc#1282523).
    - CVE-2026-96808: `revokefs` symlink path traversal allows local privilege escalation via commit tampering       (bsc#1282524).

    Changes for flatpak:

    - Update to version 1.16.6 (jsc#PED-17048):
     + Fix file descriptor leaks affecting Chromium-based browsers.
     + Fix installing extra-data without a runtime, including openh264.
     + Fix unusable sandbox-expose paths affecting Epiphany.
     + Fix installed tests and handling of file descriptor arguments.
    - Changes from version 1.16.5:
     + Fix regressions from the sandbox escape security fix affecting      browsers, browser-based apps and Steam.
     + Expand test coverage of flatpak-run features used by the portal.
    - Changes from version 1.16.4:
     + Prevent arbitrary file reads in the system-helper context      (GHSA-2fxp-43j9-pwvc).
     + Prevent orphaning cross-user pull operations (GHSA-89xm-3m96-w3jg).
    - Changes from version 1.16.3:
     + Be selective about mapping font-dirs.xml in flatpak build.
    - Changes from version 1.16.2:
     + Support reinstalling bundle installations and Intel Xe VA-API.
     + Add cancellation support for curl downloads.
     + Fix font configuration, mask and pin configuration reloads,      unintended home directory access, flatpak kill, OCI support,      memory leaks and crashes.
    - Changes from version 1.16.1:
     + Allow updating existing apps under parental controls by default.
     + Use instance IDs for systemd scopes and include /dev/udmabuf      with --device=dri.
     + Speed up prune --dry-run and permission-reset.
     + Support TLS certificates in /etc/containers/certs.d for OCI.
     + Fix portal crashes, sandbox environment handling, accessibility      bus discovery, error reporting and shell completion.
     + Update documentation and translations.

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 / SLES_SAP12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4610-1 advisory.

    - CVE-2026-90616: missing symlink protection allows a malicious sandboxed app to obtain arbitrary read and     write access       to files on the host (bsc#1280236).
    - CVE-2026-92162: path traversal via unvalidated `arch` parameter in `DeployAppstream` (bsc#1282514).
    - CVE-2026-96275: arbitrary write access as root via extra-data extraction (bsc#1282515).
    - CVE-2026-96276: arbitrary write in host context via `flatpak build-init` (bsc#1282516).
    - CVE-2026-96281: unprivileged active user can bypass anti-downgrade checks for system apps/runtimes     (bsc#1282519).
    - CVE-2026-96282: extension metadata path traversal file existence oracle (bsc#1282520).
    - CVE-2026-96283: flatpak-system-helper: cross-user `CancelPull` orphans another user's ongoing pull     (bsc#1282521).
    - CVE-2026-96807: fixed-filename writes to arbitrary locations via symlink attack on `.ld.so`     (bsc#1282523).
    - CVE-2026-96808: `revokefs` symlink path traversal allows local privilege escalation via commit tampering       (bsc#1282524).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - On a multi-user system, a user with an active local login session could downgrade a system-wide Flatpak     app to an older version by removing the app's remote ref via the unprivileged system-helper RemoveLocalRef     method, causing the anti-downgrade check to fail to find a reference date. A malicious local user could     use this to expose other users of the same system to an app version with unfixed vulnerabilities.
    (CVE-2026-96281)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
377669	SUSE SLES15: flatpak / flatpak-devel / flatpak-remote-flathub / etc (SUSE-SU-2026:5127-1)	Nessus	SuSE Local Security Checks	Local	critical
374780	SUSE SLED15: flatpak / flatpak-devel / flatpak-remote-flathub / etc (SUSE-SU-2026:4944-1)	Nessus	SuSE Local Security Checks	Local	high
369263	SUSE SLES12 Security Update : flatpak (SUSE-SU-2026:4610-1)	Nessus	SuSE Local Security Checks	Local	high
349331	Linux Distros Unpatched Vulnerability : CVE-2026-96281	Nessus	Misc.	Local	medium

Detections

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CVE-2026-96281

medium

Tenable Plugins

critical

high

high

medium