How severe is CVE-2020-28923?

CVE-2020-28923 has a CVSS 3.x base score of 2.7, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2020-28923 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-28923?

CVE-2020-28923 affects Lightbend Play Framework. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-28923?

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

When was CVE-2020-28923 published?

CVE-2020-28923 was published on 2020-12-03 and last updated on 2026-06-17.

CVE-2020-28923

CVE-2020-28923 is a low-severity vulnerability in Lightbend Play Framework with a CVSS 3.x base score of 2.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Low (CVSS 3.x base score 2.7)
CVSS v2: 4.0
EPSS exploit prediction: 1% (57th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Lightbend Play Framework
Published: 2020-12-03
Last modified: 2026-06-17

Description

An issue was discovered in Play Framework 2.8.0 through 2.8.4. Carefully crafted JSON payloads sent as a form field lead to Data Amplification. This affects users migrating from a Play version prior to 2.8.0 that used the Play Java API to serialize classes with protected or private fields to JSON.

Frequently asked questions

What is CVE-2020-28923?: An issue was discovered in Play Framework 2.8.0 through 2.8.4. Carefully crafted JSON payloads sent as a form field lead to Data Amplification. This affects users migrating from a Play version prior to 2.8.0 that used the Play Java API to serialize classes with protected or private fields to JSON.
How severe is CVE-2020-28923?: CVE-2020-28923 has a CVSS 3.x base score of 2.7, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2020-28923 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-28923?: CVE-2020-28923 affects Lightbend Play Framework. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-28923?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-28923 published?: CVE-2020-28923 was published on 2020-12-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:lightbend:play_framework:*:*:*:*:*:*:*:*

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