How severe is CVE-2026-6501?

CVE-2026-6501 has a CVSS 4.0 base score of 5.3, rated medium severity.

Is CVE-2026-6501 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-6501?

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

Does CVE-2026-6501 have an EU (EUVD) identifier?

Yes. CVE-2026-6501 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26973.

When was CVE-2026-6501 published?

CVE-2026-6501 was published on 2026-05-04 and last updated on 2026-06-17.

CVE-2026-6501

CVE-2026-6501 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-611.

Key facts

Severity: Medium (CVSS 4.0 base score 5.3)
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-26973
Weakness: CWE-611
Published: 2026-05-04
Last modified: 2026-06-17

Description

Improper restriction of XML external entity reference vulnerability in ILM Informatique jOpenDocument allows Data Serialization External Entities Blowup. This issue affects jOpenDocument: 1.5.

Frequently asked questions

What is CVE-2026-6501?: Improper restriction of XML external entity reference vulnerability in ILM Informatique jOpenDocument allows Data Serialization External Entities Blowup. This issue affects jOpenDocument: 1.5.
How severe is CVE-2026-6501?: CVE-2026-6501 has a CVSS 4.0 base score of 5.3, rated medium severity.
Is CVE-2026-6501 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-6501?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-6501 have an EU (EUVD) identifier?: Yes. CVE-2026-6501 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26973.
When was CVE-2026-6501 published?: CVE-2026-6501 was published on 2026-05-04 and last updated on 2026-06-17.

References

https://www.jopendocument.org/documentation.html

Other CWE-611 (Improper Restriction of XML External Entity Reference (XXE)) vulnerabilities

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CVE-2018-1000838 — Critical (CVSS 10.0): autopsy version <= 4.9.0 contains a XML External Entity (XXE) vulnerability in CaseMetadata XML Parser that can result…
CVE-2018-1000837 — Critical (CVSS 10.0): UML Designer version <= 8.0.0 contains a XML External Entity (XXE) vulnerability in XML parser for plugins that can…
CVE-2018-1000835 — Critical (CVSS 10.0): KeePassDX version <= 2.5.0.0beta17 contains a XML External Entity (XXE) vulnerability in kdbx file parser that can…

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