How severe is CVE-2026-59118?

CVE-2026-59118 has a CVSS 3.x base score of 9.3, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-59118 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-59118?

CVE-2026-59118 affects Microsoft Power Apps. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-59118?

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-2026-59118 published?

CVE-2026-59118 was published on 2026-08-07 and last updated on 2026-08-11.

CVE-2026-59118

CVE-2026-59118 is a critical-severity vulnerability in Microsoft Power Apps with a CVSS 3.x base score of 9.3. 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-285.

Key facts

Severity: Critical (CVSS 3.x base score 9.3)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-285
Affected product: Microsoft Power Apps
Published: 2026-08-07
Last modified: 2026-08-11

Description

Improper authorization in Copilot Cowork allows an unauthorized attacker to elevate privileges over a network.

Frequently asked questions

What is CVE-2026-59118?: Improper authorization in Copilot Cowork allows an unauthorized attacker to elevate privileges over a network.
How severe is CVE-2026-59118?: CVE-2026-59118 has a CVSS 3.x base score of 9.3, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-59118 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-59118?: CVE-2026-59118 affects Microsoft Power Apps. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-59118?: 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-2026-59118 published?: CVE-2026-59118 was published on 2026-08-07 and last updated on 2026-08-11.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-59118

Affected products (1)

cpe:2.3:a:microsoft:power_apps:-:*:*:*:*:*:*:*

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