CVE-2023-26258

Name: CVE-2023-26258
Creator: NVD / NIST
Published: 2023-07-03T15:15:10.377+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 34.20%

Last modified Jun 17, 2026

CVE-2023-26258 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Arcserve UDP through 9.0.6034 allows authentication bypass. The method getVersionInfo at WebServiceImpl/services/FlashServiceImpl leaks the AuthUUID token. EPSS estimates a 34.20% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

34.20%

98.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-863

Affected Software

Vendor	Product	Versions
Arcserve	Udp	<= 9.0.6034

References

https://support.arcserve.com/s/article/KB000015720?language=en_US
https://www.arcserve.com/products/arcserve-udpProduct
https://www.mdsec.co.uk/2023/06/cve-2023-26258-remote-code-execution-in-arcserve-udp-backup/Exploit, Technical Description, Third Party Advisory
https://support.arcserve.com/s/article/KB000015720?language=en_US
https://www.arcserve.com/products/arcserve-udpProduct
https://www.mdsec.co.uk/2023/06/cve-2023-26258-remote-code-execution-in-arcserve-udp-backup/Exploit, Technical Description, Third Party Advisory

Timeline

Published: Jul 3, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-26258?

How severe is CVE-2023-26258?

CVE-2023-26258 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 34.20% probability of exploitation in the next 30 days.

How do I fix CVE-2023-26258?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-26258?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST