How severe is CVE-2026-4901?

CVE-2026-4901 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-4901 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-4901?

CVE-2026-4901 affects Hydrosystem.poznan Control System. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-4901?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-4901 have an EU (EUVD) identifier?

Yes. CVE-2026-4901 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20888.

When was CVE-2026-4901 published?

CVE-2026-4901 was published on 2026-04-09 and last updated on 2026-06-17.

CVE-2026-4901

CVE-2026-4901 is a medium-severity vulnerability in Hydrosystem.poznan Control System with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-532.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 6.9
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-20888
Weakness: CWE-532
Affected product: Hydrosystem.poznan Control System
Published: 2026-04-09
Last modified: 2026-06-17

Description

Hydrosystem Control System 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 Hydrosystem Control System version 9.8.5

Frequently asked questions

What is CVE-2026-4901?: Hydrosystem Control System 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 Hydrosystem Control System version 9.8.5
How severe is CVE-2026-4901?: CVE-2026-4901 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-4901 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-4901?: CVE-2026-4901 affects Hydrosystem.poznan Control System. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-4901?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-4901 have an EU (EUVD) identifier?: Yes. CVE-2026-4901 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20888.
When was CVE-2026-4901 published?: CVE-2026-4901 was published on 2026-04-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:hydrosystem.poznan:control_system:*:*:*:*:*:*:*:*

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