CVE-2026-4901: AlanWeb SCADA saves sensitive information into a log file

Q: How do I fix CVE-2026-4901?

control system: upgrade to 9.8.5. Exact commands for each OS are on this page.

Q: Is CVE-2026-4901 being exploited?

CVE-2026-4901 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-2026-4901 affect?

CVE-2026-4901 affects control system. Severity is medium (CVSS 6.5). AlanWeb SCADA saves sensitive information into a log file. Critically, user credentials are logged allowing the attacker to obtain further authorized access into the system. Combined with vulnerability CVE-2026-34184, these sensitive inform

Q: How urgent is CVE-2026-4901?

Priority 27/100. No elevated risk signals yet.

Routine

MEDIUM 6.5UPGRADE

CVE-2026-4901 is a medium-severity flaw (CVSS 6.5) affecting control system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

AlanWeb SCADA saves sensitive information into a log file. Critically, user credentials are logged allowing the attacker to obtain further authorized access into the system. Combined with vulnerability CVE-2026-34184, these sensitive information could be accessed by an unauthorized user. This issue was fixed in AlanWeb SCADA version 9.8.5

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 83%)
CISA exploited list	No
Weakness	CWE-532
Published	2026-04-09
Last modified	2026-10-26

Publisher (CNA): CERT.PL · Vendor: hydrosystem.poznan

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-09 10:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

hydrosystem.poznan control system UPGRADE

Affected: < 9.8.5

Fixed in: 9.8.5

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy control-system || rpm -q control-system || control-system --version

2. UPGRADE to 9.8.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade control-system

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade control-system

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-2026-4901?

control system: upgrade to 9.8.5. Exact commands for each OS are on this page.

Is CVE-2026-4901 being exploited?

CVE-2026-4901 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-2026-4901 affect?

CVE-2026-4901 affects control system. Severity is medium (CVSS 6.5). AlanWeb SCADA saves sensitive information into a log file. Critically, user credentials are logged allowing the attacker to obtain further authorized access into the system. Combined with vulnerability CVE-2026-34184, these sensitive inform

How urgent is CVE-2026-4901?

Priority 27/100. No elevated risk signals yet.

Related CVEs

CVE-2026-34185 HIGH 8.8 UPGRADE AlanWeb SCADA is vulnerable to SQL Injection across most scripts and input parameters
CVE-2026-34184 CRITICAL 9.1 UPGRADE AlanWeb SCADA does not enforce authorization for some directories

References

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