CVE-2019-9855 [Critical] | Security Vulnerability in Libreoffice

LibreOffice is typically bundled with LibreLogo, a programmable turtle vector graphics script, which can execute arbitrary python commands contained with the document it is launched from. LibreOffice also has a feature where documents can specify that pre-installed scripts can be executed on various document script events such as mouse-over, etc. Protection was added to block calling LibreLogo from script event handers. However a Windows 8.3 path equivalence handling flaw left LibreOffice vulnerable under Windows that a document could trigger executing LibreLogo via a Windows filename pseudonym. This issue affects: Document Foundation LibreOffice 6.2 versions prior to 6.2.7; 6.3 versions prior to 6.3.1.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-05-27	0.44%	0.51%	+0.08%
2	2026-02-21	0.67%	0.44%	-0.23%
3	2025-11-21	—	0.67%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-05-27

0.44%

0.51%

+0.08%

2026-02-21

0.67%

0.44%

-0.23%

2025-11-21

—

0.67%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
9.8	3.1	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. 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:H) Serious risk that confidential data gets exposed in a big 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.	3.9	5.9	[email protected]
7.5	2.0	HIGH	`AV:N/AC:L/Au:N/C:P/I:P/A:P` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:N) No authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:P) Partial availability impact.	10.0	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

9.8

3.1

CRITICAL

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

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
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:H): Serious risk that confidential data gets exposed in a big 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.

3.9

5.9

[email protected]

7.5

2.0

HIGH

AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:L): Exploitation conditions are straightforward and predictable.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:P): Partial confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:P): Partial availability impact.

10.0

6.4

[email protected]

OS Trackers for CVE-2019-9855

vendor	priority	summary	link
`alpine`	critical	CVE-2019-9855: 1 source package rows (libreoffice); 7 state rows across 7 repos (3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 7, open 0.	https://security.alpinelinux.org/vuln/CVE-2019-9855
`debian`	unimportant	CVE-2019-9855 unimportant priority: Debian including 1 source packages (libreoffice), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2019-9855
`ubuntu`	medium	CVE-2019-9855 medium priority: Ubuntu including 1 source packages (libreoffice), 5 status rows across 5 suites (bionic, disco, trusty, upstream, xenial): not-affected 3, DNE 1, needs-triage 1.	https://ubuntu.com/security/CVE-2019-9855

Affected software / configurations for CVE-2019-9855

Vendor	Product	Version	Raw CPE
libreoffice	libreoffice	>= 6.2.0, < 6.2.7	cpe:2.3:a:libreoffice:libreoffice::::::::
libreoffice	libreoffice	>= 6.3.0, < 6.3.1	cpe:2.3:a:libreoffice:libreoffice::::::::
opensuse	leap	15.0	cpe:2.3:o:opensuse:leap:15.0:::::::*
opensuse	leap	15.1	cpe:2.3:o:opensuse:leap:15.1:::::::*

References for CVE-2019-9855

URL	Tags
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00067.html	Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00055.html	Mailing List Third Party Advisory
https://www.libreoffice.org/about-us/security/advisories/CVE-2019-9855/	Vendor Advisory

URL

CVE-2019-9855 | Windows 8.3 path equivalence handling flaw allows LibreLogo script execution

Exploit prediction scoring system (EPSS) score for CVE-2019-9855

Common vulnerability scoring system (CVSS) metrics for CVE-2019-9855

Weakness enumeration for CVE-2019-9855

OS Trackers for CVE-2019-9855

Affected software / configurations for CVE-2019-9855

References for CVE-2019-9855