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Medium, CVSS 5.4

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

CVE-2021-26544GHSA-74qp-233x-p5j8

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (org.apache.livy:livy-server 0.7.1-incubating), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
5.4 · CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
EPSS
  • CVE-2021-26544: 2.82% estimated exploitation activity in the next 30 days; percentile 86.57 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-74qp-233x-p5j8

Agent brief

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# Patch Next advisory brief: CVE-2021-26544

Advisory: Apache Livy Cross-site scripting (XSS) in session names
IDs: CVE-2021-26544, GHSA-74qp-233x-p5j8
Record: https://patchnext.com/advisories/cve-2021-26544 (revision 1, source checked 26 Oct 2026, 16:12 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: org.apache.livy:livy-server 0.7.1-incubating. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.apache.livy:livy-server: affected >= 0.7.0-incubating, <= 0.7.0-incubating; fixed in 0.7.1-incubating

## Suggested inspection (read-only)
- Maven org.apache.livy:livy-server: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.apache.livy:livy-server.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-74qp-233x-p5j8 (GitHub-reviewed advisory GHSA-74qp-233x-p5j8 lists affected ranges: Maven org.apache.livy:livy-server >=0.7.0-incubating <=0.7.0-incubating)

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