How severe is CVE-2018-4991?

CVE-2018-4991 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-4991 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-4991?

CVE-2018-4991 affects Adobe Creative Cloud. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-4991?

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-2018-4991 published?

CVE-2018-4991 was published on 2018-05-19 and last updated on 2026-06-17.

CVE-2018-4991

CVE-2018-4991 is a critical-severity vulnerability in Adobe Creative Cloud with a CVSS 3.x base score of 9.8. 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-295.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 6% (92nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-295
Affected product: Adobe Creative Cloud
Published: 2018-05-19
Last modified: 2026-06-17

Description

Adobe Creative Cloud Desktop Application versions 4.4.1.298 and earlier have an exploitable Improper certificate validation vulnerability. Successful exploitation could lead to a security bypass.

Frequently asked questions

What is CVE-2018-4991?: Adobe Creative Cloud Desktop Application versions 4.4.1.298 and earlier have an exploitable Improper certificate validation vulnerability. Successful exploitation could lead to a security bypass.
How severe is CVE-2018-4991?: CVE-2018-4991 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-4991 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-4991?: CVE-2018-4991 affects Adobe Creative Cloud. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-4991?: 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-2018-4991 published?: CVE-2018-4991 was published on 2018-05-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:adobe:creative_cloud:*:*:*:*:*:*:*:*

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