CVE-2021-26544

Apache Livy (Incubating) is vulnerable to cross site scripting

5.4 MediumFix available

Livy server version 0.7.0-incubating (only) is vulnerable to a cross site scripting issue in the session name. A malicious user could use this flaw to access logs and results of other users' sessions and run jobs with their privileges. This issue is fixed in Livy 0.7.1-incubating.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: Required

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

2.82%Up 0.4 points since Apr 14, 2021

What each source reports

NVD Score used 5.4

Record: CVE-2021-26544
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0: 3.5 LowAV:N/AC:M/Au:S/C:N/I:P/A:N
Weakness: CWE-79
Updated: 2026-11-02

CVE List No score

Apache Livy (Incubating) is vulnerable to cross site scripting

Record: CVE-2021-26544
Weakness: CWE-79
Updated: 2026-11-02

EUVDEUVD-2021-0984 0.0

Record: EUVD-2021-0984
CVSS: 0.0 NoneCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-03

GitHub AdvisoriesGHSA-74qp-233x-p5j8 5.4

Apache Livy Cross-site scripting (XSS) in session names

Record: GHSA-74qp-233x-p5j8
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSV 5.4

Record: CVE-2021-26544
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVGHSA-74qp-233x-p5j8 5.4

Apache Livy Cross-site scripting (XSS) in session names

Record: GHSA-74qp-233x-p5j8
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`org.apache.livy:livy-server` Maven	0.7.0-incubating to 0.7.0-incubating	0.7.1-incubating
`org.apache.livy:livy-server` Maven	0.7.0-incubating up to 0.7.1-incubating	0.7.1-incubating

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-26544 is a medium vulnerability (CVSS 5.4) in Apache Livy, published February 20, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.82%, the 86th percentile. Fixed in org.apache.livy:livy-server 0.7.1-incubating.