CVE-2026-30789: Use of Password Hash With Insufficient Computational Effort, Improper Restriction of Excessive Authentication

Q: How do I fix CVE-2026-30789?

rustdesk: upgrade to newer than 1.4.5. Exact commands for each OS are on this page.

Q: Is CVE-2026-30789 being exploited?

CVE-2026-30789 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-30789 affect?

CVE-2026-30789 affects rustdesk. Severity is critical (CVSS 9.8). Use of Password Hash With Insufficient Computational Effort, Improper Restriction of Excessive Authentication Attempts vulnerability in rustdesk-client RustDesk Client rustdesk-client on Windows, MacOS, Linux, iOS, Android (Client login, pe

Q: How urgent is CVE-2026-30789?

Priority 50/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-30789 is a critical-severity flaw (CVSS 9.8) affecting rustdesk. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Use of Password Hash With Insufficient Computational Effort, Improper Restriction of Excessive Authentication Attempts vulnerability in rustdesk-client RustDesk Client rustdesk-client on Windows, MacOS, Linux, iOS, Android (Client login, peer authentication modules) allows Password Brute Forcing. The authentication proof is SHA256(SHA256(password + salt) + challenge), where both the salt and the challenge are generated entirely by the server wit

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-916
Published	2026-03-05
Last modified	2026-06-22

Publisher (CNA): VULSec Labs · Vendor: rustdesk

Last updated 2026-06-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-05 16:16 UTCPublished CVE record published
2026-06-22 14:16 UTCUpdated Record last modified

rustdesk rustdesk UPGRADE

Affected: <= 1.4.5

Fixed in: newer than 1.4.5

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.4.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade rustdesk

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade rustdesk

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2026-30789?

rustdesk: upgrade to newer than 1.4.5. Exact commands for each OS are on this page.

Is CVE-2026-30789 being exploited?

CVE-2026-30789 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-2026-30789 affect?

CVE-2026-30789 affects rustdesk. Severity is critical (CVSS 9.8). Use of Password Hash With Insufficient Computational Effort, Improper Restriction of Excessive Authentication Attempts vulnerability in rustdesk-client RustDesk Client rustdesk-client on Windows, MacOS, Linux, iOS, Android (Client login, pe

How urgent is CVE-2026-30789?

Priority 50/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Windows vulnerabilities · Android vulnerabilities · iOS vulnerabilities · macOS vulnerabilities

Related CVEs

CVE-2026-30792 HIGH 8.1 UPGRADE A vulnerability in rustdesk-client RustDesk Client rustdesk-client on Windows, MacOS, Linux, iOS, Android, Web
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CVE-2026-30798 HIGH 7.5 UPGRADE Insufficient Verification of Data Authenticity, Improper Handling of Exceptional Conditions vulnerability in r
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References

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