CVE-2019-15587 [Medium] | XSS in Loofah

CVE-2019-15587 is rated Moderate Risk (50.7/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.33%). Review affected assets and schedule remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-05-29	3.03%	2.33%	-0.70%
2	2026-05-26	2.33%	3.03%	+0.70%
3	2026-05-24	—	2.33%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-05-29

3.03%

2.33%

-0.70%

2026-05-26

2.33%

3.03%

+0.70%

2026-05-24

—

2.33%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.4	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N` 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:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:N) Service keeps running; no real outage angle.	2.3	2.7	[email protected]
3.5	2.0	LOW	`AV:N/AC:M/Au:S/C:N/I:P/A:N` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:M) Exploitation needs some favorable conditions, but not exceptional ones. Authentication (AU:S) A single authentication is required. Confidentiality impact (C:N) No confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:N) No availability impact.	6.8	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

5.4

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N 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:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L): Some sensitive info could get out, but not a total data dump.
Integrity (I:L): Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N): Service keeps running; no real outage angle.

2.3

2.7

[email protected]

3.5

2.0

LOW

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

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:M): Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:S): A single authentication is required.
Confidentiality impact (C:N): No confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:N): No availability impact.

6.8

2.9

[email protected]

OS Trackers for CVE-2019-15587

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2019-15587 not yet assigned priority: Debian including 1 source packages (ruby-loofah), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2019-15587
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2019-15587
`suse`	medium	—	https://www.suse.com/security/cve/CVE-2019-15587/
`ubuntu`	medium	CVE-2019-15587 medium priority: Ubuntu including 1 source packages (ruby-loofah), 18 status rows across 18 suites (bionic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 12, ignored 2, needs-triage 2, DNE 1, released 1.	https://ubuntu.com/security/CVE-2019-15587

Affected software / configurations for CVE-2019-15587

Vendor	Product	Version	Raw CPE
loofah_project	loofah	<= 2.3.0	cpe:2.3:a:loofah_project:loofah::::::ruby::*
fedoraproject	fedora	30	cpe:2.3:o:fedoraproject:fedora:30:::::::*
fedoraproject	fedora	31	cpe:2.3:o:fedoraproject:fedora:31:::::::*
canonical	ubuntu_linux	16.04	cpe:2.3:o:canonical:ubuntu_linux:16.04::::esm:::
debian	debian_linux	9.0	cpe:2.3:o:debian:debian_linux:9.0:::::::*
debian	debian_linux	10.0	cpe:2.3:o:debian:debian_linux:10.0:::::::*

References for CVE-2019-15587

URL	Tags
https://github.com/flavorjones/loofah/issues/171	Third Party Advisory
https://hackerone.com/reports/709009	Permissions Required Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4WK2UG7ORKRQOJ6E4XJ2NVIHYJES6BYZ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XMCWPLYPNIWYAY443IZZJ4IHBBLIHBP5/
https://security.netapp.com/advisory/ntap-20191122-0003/	Third Party Advisory
https://usn.ubuntu.com/4498-1/	Third Party Advisory
https://www.debian.org/security/2019/dsa-4554	Third Party Advisory

URL

CVE-2019-15587

Exploit prediction scoring system (EPSS) score for CVE-2019-15587

Common vulnerability scoring system (CVSS) metrics for CVE-2019-15587

Weakness enumeration for CVE-2019-15587

GitHub Security Advisory for CVE-2019-15587

OS Trackers for CVE-2019-15587

Affected software / configurations for CVE-2019-15587

References for CVE-2019-15587