CVE-2023-26258

CRITICAL EXPLOITED NUCLEI

Arcserve UDP <9.0.6034 - Auth Bypass

Title source: llm
STIX 2.1

Exploitation Summary

CVE-2023-26258 has been observed exploited in the wild (reported by VulnCheck KEV). EIP tracks 1 public exploit from researchers including mdsecactivebreach. A Nuclei detection template is also available.

AI-analyzed exploit summary This repository contains a functional exploit for CVE-2023-26258, targeting ArcServe UDP's authentication bypass and information leakage vulnerability. The exploit retrieves admin credentials via SOAP API calls and includes a decryption tool for the leaked password.

Description

Arcserve UDP through 9.0.6034 allows authentication bypass. The method getVersionInfo at WebServiceImpl/services/FlashServiceImpl leaks the AuthUUID token. This token can be used at /WebServiceImpl/services/VirtualStandbyServiceImpl to obtain a valid session. This session can be used to execute any task as administrator.

Exploits (1)

nomisec WORKING POC 23 stars
by mdsecactivebreach · remote
https://github.com/mdsecactivebreach/CVE-2023-26258-ArcServe

This repository contains a functional exploit for CVE-2023-26258, targeting ArcServe UDP's authentication bypass and information leakage vulnerability. The exploit retrieves admin credentials via SOAP API calls and includes a decryption tool for the leaked password.

Classification
Working Poc 95%
Attack Type
Info Leak
Complexity
Moderate
Reliability
Reliable
Target: ArcServe UDP
No auth needed
Prerequisites: Network access to ArcServe UDP service on port 8014
devstral-2 · analyzed Feb 18, 2026 Full analysis →

Nuclei Templates (1)

Arcserve UDP <= 9.0.6034 - Authentication Bypass
CRITICALVERIFIEDby daffainfo
Shodan: http.favicon.hash:-1889244460

Scores

CVSS v3 9.8
EPSS 0.3419
EPSS Percentile 98.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact total

Details

VulnCheck KEV 2025-08-19
CWE
CWE-863
Status published
Products (1)
arcserve/udp < 9.0.6034
Published Jul 03, 2023
Tracked Since Feb 18, 2026