Is CVE-2018-25350 actively exploited?

No active exploitation of CVE-2018-25350 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2018-25350 be exploited remotely?

Yes. CVE-2018-25350 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2018-25350?

CVE-2018-25350 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2018-25350

CWE-204Published: May 23, 2026· Updated: Jun 17, 2026

9.8

CVSS v3.1

EPSS:0.08%probability of exploitation in 30 daysPercentile:22.6th

Official 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.

NVD Source

Risk Analysis

This critical vulnerability in userSpice allows unauthenticated attackers to enumerate valid usernames remotely. By analyzing server responses to POST requests, attackers can identify existing accounts, which can then be used for further attacks like brute-forcing or credential stuffing. The CVSS score of 9.8 highlights the severity of this information disclosure.

No public exploit is currently known for this vulnerability. Its remote exploitability and low attack complexity mean it could be easily leveraged by attackers to gather sensitive information.

Recommended Action

Users of userSpice 4.3.24 should monitor for vendor-provided patches or updates. Implement rate limiting and CAPTCHA mechanisms on login and registration forms to prevent automated username enumeration.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2018-25350 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.