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CVE-2021-26544

20
FAUCET Score

CVE-2021-26544 describes a cross-site scripting (XSS) vulnerability in Apache Livy server version 0.7.0-incubating, specifically within the session name parameter. This flaw allows a malicious actor to access other users' session logs and results, and potentially execute jobs with their privileges. Rated as Medium severity (CVSS 5.4), the attack requires user interaction and low privileges, with a potential impact of limited confidentiality and integrity compromise. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
0.7.0-incubatingCPE matchmatch criteria
cpe:2.3:a:apache:livy:0.7.0-incubating:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.4MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.3
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.82%
Probability of exploitation in next 30 days
EPSS Percentile
85.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0282 is in the 98th percentile among its peer group of 15,225 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
mavenpatch availablevia ghsa
Product: org.apache.livy:livy-serverFixed in: 0.7.1-incubating

Vendor Advisories (1)

mavenGHSA-74qp-233x-p5j8medium

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

May 13, 2021

References

github.com / apache/incubator-livy/commit/4d8a912699683b973eee76d4e91447d769a0cb0d
PatchThird Party Advisory
lists.apache.org / thread.html/r2db14e7fd1e5ec2519e8828d43529bad623d75698cc7918af3a3f3ed%40%3Cuser.livy.apache.org%3E
PatchVendor Advisory
openwall.com / lists/oss-security/2021/02/20/1
Mailing ListPatchThird Party Advisory