How severe is CVE-2023-23911?

CVE-2023-23911 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2023-23911 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-23911?

CVE-2023-23911 affects Rocket.chat. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-23911?

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-2023-23911 published?

CVE-2023-23911 was published on 2023-03-10 and last updated on 2026-06-17.

CVE-2023-23911

CVE-2023-23911 is a high-severity vulnerability in Rocket.chat with a CVSS 3.x base score of 7.5. 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-326.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-326
Affected product: Rocket.chat
Published: 2023-03-10
Last modified: 2026-06-17

Description

An improper access control vulnerability exists prior to v6 that could allow an attacker to break the E2E encryption of a chat room by a user changing the group key of a chat room.

Frequently asked questions

What is CVE-2023-23911?: An improper access control vulnerability exists prior to v6 that could allow an attacker to break the E2E encryption of a chat room by a user changing the group key of a chat room.
How severe is CVE-2023-23911?: CVE-2023-23911 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2023-23911 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-23911?: CVE-2023-23911 affects Rocket.chat. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-23911?: 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-2023-23911 published?: CVE-2023-23911 was published on 2023-03-10 and last updated on 2026-06-17.

References

https://hackerone.com/reports/1757663

Affected products (1)

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

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