How severe is CVE-2020-35774?

CVE-2020-35774 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2020-35774 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 88% (100th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-35774?

CVE-2020-35774 affects Twitter Twitter-server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-35774?

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

When was CVE-2020-35774 published?

CVE-2020-35774 was published on 2020-12-29 and last updated on 2026-06-17.

CVE-2020-35774

CVE-2020-35774 is a medium-severity vulnerability in Twitter Twitter-server with a CVSS 3.x base score of 5.4. Its EPSS exploit-prediction score of 88% places it in the 100th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 88% (100th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Twitter Twitter-server
Published: 2020-12-29
Last modified: 2026-06-17

Description

server/handler/HistogramQueryHandler.scala in Twitter TwitterServer (aka twitter-server) before 20.12.0, in some configurations, allows XSS via the /histograms endpoint.

Frequently asked questions

What is CVE-2020-35774?: server/handler/HistogramQueryHandler.scala in Twitter TwitterServer (aka twitter-server) before 20.12.0, in some configurations, allows XSS via the /histograms endpoint.
How severe is CVE-2020-35774?: CVE-2020-35774 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2020-35774 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 88% (100th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-35774?: CVE-2020-35774 affects Twitter Twitter-server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-35774?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-35774 published?: CVE-2020-35774 was published on 2020-12-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:twitter:twitter-server:*:*:*:*:*:*:*:*

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