CVE-2023-26258
Arcserve UDP through 9.0.6034 allows authentication bypass.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 39.8%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 39.77% probability · 99th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-863
- Affected
- arcserve/udp
- Source
- cve@mitre.org
EPSS moved from 39.8% on 24 September 2026 to 39.8% on 6 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.