How severe is CVE-2026-4048?

CVE-2026-4048 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-4048 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-4048?

CVE-2026-4048 primarily affects Progress Connection Manager For Objectscale. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-4048?

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

Does CVE-2026-4048 have an EU (EUVD) identifier?

Yes. CVE-2026-4048 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23859.

When was CVE-2026-4048 published?

CVE-2026-4048 was published on 2026-04-20 and last updated on 2026-06-17.

CVE-2026-4048

CVE-2026-4048 is a high-severity vulnerability in Progress Connection Manager For Objectscale with a CVSS 3.x base score of 8.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-77.

Key facts

Severity: High (CVSS 3.x base score 8.4)
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-23859
Weakness: CWE-77
Affected product: Progress Connection Manager For Objectscale
Published: 2026-04-20
Last modified: 2026-06-17

Description

OS Command Injection Remote Code Execution Vulnerability in UI in Progress ADC Products allows an authenticated attacker with “All” permissions to execute arbitrary commands on the LoadMaster appliance by exploiting unsanitized input in a custom WAF rule file during the file upload process.

Frequently asked questions

What is CVE-2026-4048?: OS Command Injection Remote Code Execution Vulnerability in UI in Progress ADC Products allows an authenticated attacker with “All” permissions to execute arbitrary commands on the LoadMaster appliance by exploiting unsanitized input in a custom WAF rule file during the file upload process.
How severe is CVE-2026-4048?: CVE-2026-4048 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-4048 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-4048?: CVE-2026-4048 primarily affects Progress Connection Manager For Objectscale. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-4048?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-4048 have an EU (EUVD) identifier?: Yes. CVE-2026-4048 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23859.
When was CVE-2026-4048 published?: CVE-2026-4048 was published on 2026-04-20 and last updated on 2026-06-17.

References

https://community.progress.com/s/article/LoadMaster-Security-Vulnerabilites-CVE-2026-3517-CVE-2026-3518-CVE-2026-3519-CVE-2026-4048-CVE-2026-21876

Affected products (4)

cpe:2.3:a:progress:connection_manager_for_objectscale:*:*:*:*:*:*:*:*
cpe:2.3:a:progress:ecs_connection_manager:*:*:*:*:*:*:*:*
cpe:2.3:a:progress:loadmaster:*:*:*:*:ltsf:*:*:*
cpe:2.3:a:progress:loadmaster:*:*:*:*:ga:*:*:*

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