← Vulnerability feed

Vulnerability record · CVE-2023-54355 · published 9 September 2026

CVE-2023-54355: Improper verification of cryptographic signature vulnerability

PocketMine-MP versions before 5.3.1 and 4.23.1 fail to validate that the identityPublicKey in LoginPacket uses the required secp384r1 elliptic curve. Attackers can provide LoginPackets with keys using different curves or non-EC key types to pass login verification but trigger an uncaught exception during ECDH key derivation, crashing the server.

8.7 CVSS 4.0 High EPSS 0.22% · top 88.2% CWE-347 · Improper verification of cryptographic signature Deferred
8.7CVSS 4.0 base score
0.22%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
10 Sep 2026Last modified by NVD

Description

PocketMine-MP versions before 5.3.1 and 4.23.1 fail to validate that the identityPublicKey in LoginPacket uses the required secp384r1 elliptic curve. Attackers can provide LoginPackets with keys using different curves or non-EC key types to pass login verification but trigger an uncaught exception during ECDH key derivation, crashing the server.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/pmmp/PocketMine-MP/commit/4e646d19a4a1e0d082bd4d1f5a58ae0182a268d9
https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-79rc-jjh6-rc89
https://www.vulncheck.com/advisories/pocketmine-mp-5.2.0-server-crash-via-incorrect-ec-curve

Track CVE-2023-54355 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2026-5430Wso2 api control plane improper verification of cryptographic signature vulnerabilityThe JWT authentication mechanism accepts tokens signed with algorithms other than those explicitly configured or supported. This allows an attacker t…KEVEPSS 0.59%9.5CVE-2026-48558SimpleHelp OIDC authentication bypass via unverified token signatureSimpleHelp 5.5.15 and earlier and 6.0 pre-release versions accept OIDC identity tokens without verifying their cryptographic signature. When OIDC is …KEVEPSS 5.7%analysed9.8CVE-2025-59718Fortinet FortiOS/FortiProxy SAML signature check bypass in FortiCloud SSOFortiOS, FortiProxy and FortiSwitchManager fail to properly verify the cryptographic signature of SAML responses used for FortiCloud SSO login. An un…KEVEPSS 68%analysed4.6CVE-2025-47827IGEL OS Secure Boot bypass via improper signature verificationIGEL OS before version 11 fails to properly verify a cryptographic signature in the igel-flash-driver module, allowing Secure Boot to be bypassed. A …KEVEPSS 4.9%analysed10.0CVE-2020-2021PAN-OS SAML signature verification bypass allows authentication bypassPAN-OS fails to properly verify SAML signatures when SAML authentication is enabled and the 'Validate Identity Provider Certificate' option is unchec…KEVEPSS 4.4%analysed5.5CVE-2013-3900Windows WinVerifyTrust Authenticode signature verification RCECVE-2013-3900 is a remote code execution flaw in how the Windows WinVerifyTrust function verifies Authenticode signatures on portable executable file…KEVEPSS 45%analysed7.8CVE-2020-1464Windows file signature validation spoofing allows loading of improperly signed filesWindows incorrectly validates file signatures, so a crafted file can be treated as properly signed. This lets an attacker bypass the security feature…KEVEPSS 39%analysed

Source: NIST National Vulnerability Database (record CVE-2023-54355), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.