How severe is CVE-2018-25350?

CVE-2018-25350 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-25350 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2018-25350?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2018-25350 have an EU (EUVD) identifier?

Yes. CVE-2018-25350 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2018-21874.

When was CVE-2018-25350 published?

CVE-2018-25350 was published on 2026-05-23 and last updated on 2026-06-17.

CVE-2018-25350

CVE-2018-25350 is a critical-severity vulnerability with a CVSS 3.x base score of 9.8. 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-204.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.3
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2018-21874
Weakness: CWE-204
Published: 2026-05-23
Last modified: 2026-06-17

Description

userSpice 4.3.24 contains a username enumeration vulnerability that allows unauthenticated attackers to discover valid usernames by sending POST requests to the existingUsernameCheck.php endpoint. Attackers can submit usernames and analyze response text for the 'taken' string to identify existing accounts in the system.

Frequently asked questions

What is CVE-2018-25350?: userSpice 4.3.24 contains a username enumeration vulnerability that allows unauthenticated attackers to discover valid usernames by sending POST requests to the existingUsernameCheck.php endpoint. Attackers can submit usernames and analyze response text for the 'taken' string to identify existing accounts in the system.
How severe is CVE-2018-25350?: CVE-2018-25350 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-25350 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2018-25350?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2018-25350 have an EU (EUVD) identifier?: Yes. CVE-2018-25350 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2018-21874.
When was CVE-2018-25350 published?: CVE-2018-25350 was published on 2026-05-23 and last updated on 2026-06-17.

References

Other CWE-204 vulnerabilities

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CVE-2025-3092 — High (CVSS 7.5): An unauthenticated remote attacker can enumerate valid user names from an unprotected endpoint.
CVE-2026-4113 — High (CVSS 7.2): An observable response discrepancy vulnerability in the SonicWall SMA1000 series appliances allows a remote attacker to…

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