How severe is CVE-2021-28661?

CVE-2021-28661 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2021-28661 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28661?

CVE-2021-28661 affects Silverstripe. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-28661?

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

When was CVE-2021-28661 published?

CVE-2021-28661 was published on 2021-10-07 and last updated on 2026-06-17.

CVE-2021-28661

CVE-2021-28661 is a medium-severity vulnerability in Silverstripe with a CVSS 3.x base score of 4.3. 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-863.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.0
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-863
Affected product: Silverstripe
Published: 2021-10-07
Last modified: 2026-06-17

Description

Default SilverStripe GraphQL Server (aka silverstripe/graphql) 3.x through 3.4.1 permission checker not inherited by query subclass.

Frequently asked questions

What is CVE-2021-28661?: Default SilverStripe GraphQL Server (aka silverstripe/graphql) 3.x through 3.4.1 permission checker not inherited by query subclass.
How severe is CVE-2021-28661?: CVE-2021-28661 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2021-28661 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28661?: CVE-2021-28661 affects Silverstripe. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-28661?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-28661 published?: CVE-2021-28661 was published on 2021-10-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:silverstripe:silverstripe:*:*:*:*:*:*:*:*

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