How severe is CVE-2020-1242?

CVE-2020-1242 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2020-1242 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-1242?

CVE-2020-1242 affects Microsoft Edge. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-1242?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-1242 published?

CVE-2020-1242 was published on 2020-06-09 and last updated on 2026-06-17.

CVE-2020-1242

CVE-2020-1242 is a medium-severity vulnerability in Microsoft Edge with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 2.6
EPSS exploit prediction: 4% (89th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Edge
Published: 2020-06-09
Last modified: 2026-06-17

Description

An information disclosure vulnerability exists in the way that Microsoft Edge handles cross-origin requests, aka 'Microsoft Edge Information Disclosure Vulnerability'.

Frequently asked questions

What is CVE-2020-1242?: An information disclosure vulnerability exists in the way that Microsoft Edge handles cross-origin requests, aka 'Microsoft Edge Information Disclosure Vulnerability'.
How severe is CVE-2020-1242?: CVE-2020-1242 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2020-1242 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-1242?: CVE-2020-1242 affects Microsoft Edge. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-1242?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-1242 published?: CVE-2020-1242 was published on 2020-06-09 and last updated on 2026-06-17.

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1242

Affected products (1)

cpe:2.3:a:microsoft:edge:-:*:*:*:*:*:*:*

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