CVE-2026-48582
CVE-2026-48582 is a critical-severity vulnerability in Microsoft Exchange Online with a CVSS 3.x base score of 9.6. 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-862.
Key facts
- Severity: Critical (CVSS 3.x base score 9.6)
- EPSS exploit prediction: 1% (51st percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-38090
- Weakness: CWE-862
- Affected product: Microsoft Exchange Online
- Published:
- Last modified:
Description
Missing authorization in Microsoft Exchange Online allows an authorized attacker to elevate privileges over a network.
Frequently asked questions
- What is CVE-2026-48582?
- Missing authorization in Microsoft Exchange Online allows an authorized attacker to elevate privileges over a network.
- How severe is CVE-2026-48582?
- CVE-2026-48582 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
- Is CVE-2026-48582 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-48582?
- CVE-2026-48582 affects Microsoft Exchange Online. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-48582?
- 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.
- Does CVE-2026-48582 have an EU (EUVD) identifier?
- Yes. CVE-2026-48582 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38090.
- When was CVE-2026-48582 published?
- CVE-2026-48582 was published on 2026-06-19 and last updated on 2026-06-24.
References
Affected products (1)
- cpe:2.3:a:microsoft:exchange_online:-:*:*:*:*:*:*:*
More vulnerabilities in Microsoft Exchange Online
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