How severe is CVE-2020-15110?

CVE-2020-15110 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2020-15110 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-15110?

CVE-2020-15110 affects Jupyterhub Kubespawner. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-15110?

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

When was CVE-2020-15110 published?

CVE-2020-15110 was published on 2020-07-17 and last updated on 2026-06-17.

CVE-2020-15110

CVE-2020-15110 is a medium-severity vulnerability in Jupyterhub Kubespawner with a CVSS 3.x base score of 6.8. 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-863.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
CVSS v2: 5.5
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-863
Affected product: Jupyterhub Kubespawner
Published: 2020-07-17
Last modified: 2026-06-17

Description

In jupyterhub-kubespawner before 0.12, certain usernames will be able to craft particular server names which will grant them access to the default server of other users who have matching usernames. This has been fixed in 0.12.

Frequently asked questions

What is CVE-2020-15110?: In jupyterhub-kubespawner before 0.12, certain usernames will be able to craft particular server names which will grant them access to the default server of other users who have matching usernames. This has been fixed in 0.12.
How severe is CVE-2020-15110?: CVE-2020-15110 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2020-15110 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-15110?: CVE-2020-15110 affects Jupyterhub Kubespawner. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-15110?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-15110 published?: CVE-2020-15110 was published on 2020-07-17 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:jupyterhub:kubespawner:*:*:*:*:*:*:*:*

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