CVE-2021-44042: An issue was discovered in UiPath Assistant 21.4.4

This month

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2021-44042 is a critical-severity flaw (CVSS 9.8) affecting assistant. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in UiPath Assistant 21.4.4. User-controlled data supplied to the --process-start argument of the URI handler for uipath-assistant:// is not correctly encoded, resulting in attacker-controlled content being injected into the error message displayed (when the injected content does not match an existing process). A determined attacker could leverage this to execute JavaScript in the context of the Electron application.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-116
Published	2021-12-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: uipath

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-12-14 18:15 UTCPublished CVE record published
2026-06-17 04:11 UTCUpdated Record last modified

uipath assistant DOWNGRADE

Affected: 21.4.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 21.4.4

1. Check installed version

apt-cache policy assistant || rpm -q assistant || assistant --version

2. No fixed release: DOWNGRADE to a release before 21.4.4 (Debian / Ubuntu)

apt-cache madison assistant sudo apt install assistant=<VERSION_BEFORE_21.4.4> sudo apt-mark hold assistant

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list assistant sudo dnf downgrade assistant-<VERSION_BEFORE_21.4.4> sudo dnf versionlock add assistant

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-44042?

assistant: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-44042 being exploited?

CVE-2021-44042 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-44042 affect?

CVE-2021-44042 affects assistant. Severity is critical (CVSS 9.8). An issue was discovered in UiPath Assistant 21.4.4. User-controlled data supplied to the --process-start argument of the URI handler for uipath-assistant:// is not correctly encoded, resulting in attacker-controlled content being injected i

How urgent is CVE-2021-44042?

Priority 56/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Electron vulnerabilities

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References

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