How severe is CVE-2023-26258?

CVE-2023-26258 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-26258 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 38% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-26258?

CVE-2023-26258 affects Arcserve Udp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-26258?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2023-26258 published?

CVE-2023-26258 was published on 2023-07-03 and last updated on 2026-06-17.

CVE-2023-26258

CVE-2023-26258 is a critical-severity vulnerability in Arcserve Udp with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 38% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-863.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 38% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-863
Affected product: Arcserve Udp
Published: 2023-07-03
Last modified: 2026-06-17

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.

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.
How severe is CVE-2023-26258?: CVE-2023-26258 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-26258 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 38% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-26258?: CVE-2023-26258 affects Arcserve Udp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-26258?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-26258 published?: CVE-2023-26258 was published on 2023-07-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:arcserve:udp:*:*:*:*:*:*:*:*

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