How severe is CVE-2023-49079?

CVE-2023-49079 has a CVSS 3.x base score of 9.3, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability none.

Is CVE-2023-49079 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-49079?

CVE-2023-49079 affects Misskey. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-49079?

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

When was CVE-2023-49079 published?

CVE-2023-49079 was published on 2023-11-29 and last updated on 2026-06-17.

CVE-2023-49079

CVE-2023-49079 is a critical-severity vulnerability in Misskey with a CVSS 3.x base score of 9.3. 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-347.

Key facts

Severity: Critical (CVSS 3.x base score 9.3)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-347
Affected product: Misskey
Published: 2023-11-29
Last modified: 2026-06-17

Description

Misskey is an open source, decentralized social media platform. Misskey's missing signature validation allows arbitrary users to impersonate any remote user. This issue has been patched in version 2023.11.1-beta.1.

Frequently asked questions

What is CVE-2023-49079?: Misskey is an open source, decentralized social media platform. Misskey's missing signature validation allows arbitrary users to impersonate any remote user. This issue has been patched in version 2023.11.1-beta.1.
How severe is CVE-2023-49079?: CVE-2023-49079 has a CVSS 3.x base score of 9.3, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability none.
Is CVE-2023-49079 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-49079?: CVE-2023-49079 affects Misskey. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-49079?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-49079 published?: CVE-2023-49079 was published on 2023-11-29 and last updated on 2026-06-17.

References

https://github.com/misskey-dev/misskey/security/advisories/GHSA-3f39-6537-3cgc

Affected products (1)

cpe:2.3:a:misskey:misskey:*:*:*:*:*:*:*:*

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