How severe is CVE-2020-35666?

CVE-2020-35666 has a CVSS 3.x base score of 8.8, rated high 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 high.

Is CVE-2020-35666 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-35666?

CVE-2020-35666 affects Steedos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-35666?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-35666 published?

CVE-2020-35666 was published on 2020-12-23 and last updated on 2026-06-17.

CVE-2020-35666

CVE-2020-35666 is a high-severity vulnerability in Steedos with a CVSS 3.x base score of 8.8. 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-89.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-89
Affected product: Steedos
Published: 2020-12-23
Last modified: 2026-06-17

Description

Steedos Platform through 1.21.24 allows NoSQL injection because the /api/collection/findone implementation in server/packages/steedos_base.js mishandles req.body validation, as demonstrated by MongoDB operator attacks such as an X-User-Id[$ne]=1 value.

Frequently asked questions

What is CVE-2020-35666?: Steedos Platform through 1.21.24 allows NoSQL injection because the /api/collection/findone implementation in server/packages/steedos_base.js mishandles req.body validation, as demonstrated by MongoDB operator attacks such as an X-User-Id[$ne]=1 value.
How severe is CVE-2020-35666?: CVE-2020-35666 has a CVSS 3.x base score of 8.8, rated high 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 high.
Is CVE-2020-35666 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-35666?: CVE-2020-35666 affects Steedos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-35666?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-35666 published?: CVE-2020-35666 was published on 2020-12-23 and last updated on 2026-06-17.

References

https://github.com/steedos/steedos-platform/issues/1245

Affected products (1)

cpe:2.3:a:steedos:steedos:*:*:*:*:*:*:*:*

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