How severe is CVE-2021-26439?

CVE-2021-26439 has a CVSS 3.x base score of 4.6, rated medium severity. It is exploitable over physical access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-26439 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26439?

CVE-2021-26439 affects Microsoft Edge. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-26439?

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

When was CVE-2021-26439 published?

CVE-2021-26439 was published on 2021-09-02 and last updated on 2026-06-17.

CVE-2021-26439

CVE-2021-26439 is a medium-severity vulnerability in Microsoft Edge with a CVSS 3.x base score of 4.6. 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 4.6)
CVSS v2: 4.3
EPSS exploit prediction: 2% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Edge
Published: 2021-09-02
Last modified: 2026-06-17

Description

Microsoft Edge for Android Information Disclosure Vulnerability

Frequently asked questions

What is CVE-2021-26439?: Microsoft Edge for Android Information Disclosure Vulnerability
How severe is CVE-2021-26439?: CVE-2021-26439 has a CVSS 3.x base score of 4.6, rated medium severity. It is exploitable over physical access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-26439 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-26439?: CVE-2021-26439 affects Microsoft Edge. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-26439?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-26439 published?: CVE-2021-26439 was published on 2021-09-02 and last updated on 2026-06-17.

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26439

Affected products (1)

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

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