EUVD-2026-31473
GHSA-jxfv-852c-jjfw
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Network-reachable with no authentication; path traversal enables sensitive file read (C:H) and claimed arbitrary code execution via file write (I:H); no direct availability impact described.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
3DescriptionCVE.org
Directory Traversal vulnerability in Easy Chat Server 3.1 allows a remote attacker to obtain sensitive information and execute arbitrary code via the UserName parameter
AnalysisAI
Directory traversal in Easy Chat Server 3.1 enables remote unauthenticated attackers to read arbitrary files and potentially execute arbitrary code by supplying path traversal sequences in the UserName parameter. The CVSS vector (PR:N/AV:N/AC:L) confirms exploitation requires no authentication and low complexity, and a public proof-of-concept repository is available on GitHub (NullByte8080/CVE-2026-36227). Despite the RCE tag and unauthenticated network vector, EPSS sits at just 0.14% (33rd percentile) and SSVC reports no active exploitation, suggesting this is not yet being leveraged at scale.
Technical ContextAI
CWE-22 (Improper Limitation of a Pathname to a Restricted Directory) describes a failure to canonicalize or sanitize user-controlled path components before using them in filesystem operations. In Easy Chat Server 3.1, the UserName parameter - likely used for session identification, logging, or file-based user storage - is passed unsanitized into a file path construction routine, allowing an attacker to inject sequences such as '../../' to escape the intended working directory. The CPE string supplied by NVD is a placeholder (cpe:2.3:a:n/a:n/a:*:*:*:*:*:*:*:*), meaning no authoritative vendor CPE is recorded; affected product scope is inferred solely from the description. The RCE tag in the intelligence data suggests the traversal may extend to writing or overwriting executable files or configuration files, not merely reading them, though the mechanism is not described in the available data.
RemediationAI
No vendor-released patch has been identified at time of analysis; the vendor site (http://easy.com) should be monitored for an advisory. Until a patch is available, defenders should restrict network access to the Easy Chat Server to trusted IP ranges or internal networks only, as the attack vector is fully remote. Input validation or a web application firewall rule blocking path traversal sequences (e.g., '../', '%2e%2e%2f', encoded variants) in the UserName parameter provides a compensating control, though WAF bypass is possible with encoding variations and should not be treated as a permanent fix. If the server is not business-critical, temporary decommissioning should be considered given the combination of unauthenticated network access and claimed RCE capability. The public POC at https://github.com/NullByte8080/CVE-2026-36227 should be reviewed to understand the exact exploitation mechanism and refine blocking rules accordingly.
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Same weakness CWE-22 – Path Traversal
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External POC / Exploit Code
Leaving vuln.today