How severe is CVE-2026-42337?

CVE-2026-42337 has a CVSS 4.0 base score of 5.3, rated medium severity.

Is CVE-2026-42337 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-42337?

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

Does CVE-2026-42337 have an EU (EUVD) identifier?

Yes. CVE-2026-42337 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31988.

When was CVE-2026-42337 published?

CVE-2026-42337 was published on 2026-05-26 and last updated on 2026-06-17.

CVE-2026-42337

CVE-2026-42337 is a medium-severity vulnerability with a CVSS 4.0 base score of 5.3. 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-862.

Key facts

Severity: Medium (CVSS 4.0 base score 5.3)
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-31988
Weakness: CWE-862
Published: 2026-05-26
Last modified: 2026-06-17

Description

MaxKB is an open-source AI assistant for enterprise. MaxKB 2.8.0 and prior are vulnerable to a broken access control vulnerability in the OSS file service URL fetch API (chat/api/oss/get_url). The endpoint uses application_id from the URL path without validating ownership, allowing attackers to perform operations under other applications’ policies. This vulnerability is fixed in 2.8.1.

Frequently asked questions

What is CVE-2026-42337?: MaxKB is an open-source AI assistant for enterprise. MaxKB 2.8.0 and prior are vulnerable to a broken access control vulnerability in the OSS file service URL fetch API (chat/api/oss/get_url). The endpoint uses application_id from the URL path without validating ownership, allowing attackers to perform operations under other applications’ policies. This vulnerability is fixed in 2.8.1.
How severe is CVE-2026-42337?: CVE-2026-42337 has a CVSS 4.0 base score of 5.3, rated medium severity.
Is CVE-2026-42337 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-42337?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-42337 have an EU (EUVD) identifier?: Yes. CVE-2026-42337 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31988.
When was CVE-2026-42337 published?: CVE-2026-42337 was published on 2026-05-26 and last updated on 2026-06-17.

References

https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-2jmj-gwvg-3gp2

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