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ExploitedNot in CISA KEV yet

CVE-2023-26258

Exploitation confirmed. First attested on 2025-08-19 by GCVE · kevintel, GCVE · shadowserver.

  • Published2023-07-03
  • WeaknessCWE-863

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2023-07-0315:15CVE publishedNVD
  2. 2025-08-1906:22Listed as exploited by GCVEGCVE
  3. 2025-08-1906:22Exploitation first reportedGCVE

Observed activity

isMalicious corpus · updated 2026-11-03 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-26258?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-26258?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Arcserve udp
BranchAffectedFixed in
9.0≤ 9.0.6034no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

No fix published by the sources we read yet. NVD record

Detection

read 2026-11-02 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
1 repository, unverifiedmdsecactivebreach/CVE-2023-26258-ArcServe
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2023-07-03
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-wvxg-vj6j-j677

Frequently asked questions

What is CVE-2023-26258?

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.

Is CVE-2023-26258 actively exploited?

A proof-of-concept exploit exists for CVE-2023-26258, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2023-26258?

CVE-2023-26258 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record