How severe is CVE-2020-15926?

CVE-2020-15926 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2020-15926 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-15926?

CVE-2020-15926 affects Rocket.chat. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-15926?

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

When was CVE-2020-15926 published?

CVE-2020-15926 was published on 2020-08-18 and last updated on 2026-06-17.

CVE-2020-15926

CVE-2020-15926 is a medium-severity vulnerability in Rocket.chat with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Rocket.chat
Published: 2020-08-18
Last modified: 2026-06-17

Description

Rocket.Chat through 3.4.2 allows XSS where an attacker can send a specially crafted message to a channel or in a direct message to the client which results in remote code execution on the client side.

Frequently asked questions

What is CVE-2020-15926?: Rocket.Chat through 3.4.2 allows XSS where an attacker can send a specially crafted message to a channel or in a direct message to the client which results in remote code execution on the client side.
How severe is CVE-2020-15926?: CVE-2020-15926 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2020-15926 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-15926?: CVE-2020-15926 affects Rocket.chat. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-15926?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-15926 published?: CVE-2020-15926 was published on 2020-08-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:rocket.chat:rocket.chat:*:*:*:*:*:*:*:*

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