CVE-2026-40354 [Low] | Security Vulnerability in Xdg-Desktop-Portal

CVE-2026-40354 is rated Low Risk (12.5/100): CVSS Low severity, with low exploitation likelihood (EPSS 0.01%). Low composite risk—no urgent action required; patch on your normal maintenance cycle and revisit priority if CVSS or EPSS increases.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-04-11	—	0.01%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-04-11

—

0.01%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
2.9	3.1	LOW	`CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. Attack complexity (AC:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.	1.4	1.4	[email protected]
6.3	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. Attack complexity (AC:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.0	5.2	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

2.9

3.1

LOW

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L Click to expand

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:L): Might cause slowdowns, glitches, or partial disruption—not a full brick.

1.4

[email protected]

6.3

3.1

MEDIUM

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H Click to expand

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.0

5.2

[email protected]

OS Trackers for CVE-2026-40354

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2026-40354 not yet assigned priority: Debian including 1 source packages (xdg-desktop-portal), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 3, resolved 2.	https://security-tracker.debian.org/tracker/CVE-2026-40354
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2026-40354
`suse`	medium	—	https://www.suse.com/security/cve/CVE-2026-40354/
`ubuntu`	medium	CVE-2026-40354 medium priority: Ubuntu including 1 source packages (xdg-desktop-portal), 7 status rows across 7 suites (bionic, focal, jammy, noble, questing, upstream, xenial): needs-triage 6, released 1.	https://ubuntu.com/security/CVE-2026-40354

Affected software / configurations for CVE-2026-40354

Vendor	Product	Version	Raw CPE
flatpak	xdg-desktop-portal	< 1.20.4	cpe:2.3:a:flatpak:xdg-desktop-portal::::::::
flatpak	xdg-desktop-portal	1.21.0	cpe:2.3:a:flatpak:xdg-desktop-portal:1.21.0:::::::*

References for CVE-2026-40354

URL	Tags
https://github.com/flatpak/xdg-desktop-portal/releases/tag/1.20.4	Product
https://github.com/flatpak/xdg-desktop-portal/releases/tag/1.21.1	Product
https://github.com/flatpak/xdg-desktop-portal/security/advisories/GHSA-rqr9-jwwf-wxgj	Vendor Advisory
https://www.openwall.com/lists/oss-security/2026/04/10/14	Mailing List

URL

CVE-2026-40354

Exploit prediction scoring system (EPSS) score for CVE-2026-40354

Common vulnerability scoring system (CVSS) metrics for CVE-2026-40354

Weakness enumeration for CVE-2026-40354

OS Trackers for CVE-2026-40354

Affected software / configurations for CVE-2026-40354

References for CVE-2026-40354