How severe is CVE-2026-11859?

CVE-2026-11859 has a CVSS 4.0 base score of 2.0, rated low severity.

Is CVE-2026-11859 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.

How do I fix CVE-2026-11859?

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

Does CVE-2026-11859 have an EU (EUVD) identifier?

Yes. CVE-2026-11859 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36001.

When was CVE-2026-11859 published?

CVE-2026-11859 was published on 2026-06-10 and last updated on 2026-06-17.

CVE-2026-11859

CVE-2026-11859 is a low-severity vulnerability with a CVSS 4.0 base score of 2.0. 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-74.

Key facts

Severity: Low (CVSS 4.0 base score 2.0)
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36001
Weakness: CWE-74
Published: 2026-06-10
Last modified: 2026-06-17

Description

An HTML injection vulnerability in the "fetch links" email sent by Thinkst Applied Research Canarytokens, enabling Interface Manipulation, Cross-Site Scripting (XSS) in emails clients that render HTML emails. This issue affects Canarytokens: from Docker tag sha-c0f3cf142 before sha-08c3f93d, from Git commit c0f3cf142 before 08c3f93d.

Frequently asked questions

What is CVE-2026-11859?: An HTML injection vulnerability in the "fetch links" email sent by Thinkst Applied Research Canarytokens, enabling Interface Manipulation, Cross-Site Scripting (XSS) in emails clients that render HTML emails. This issue affects Canarytokens: from Docker tag sha-c0f3cf142 before sha-08c3f93d, from Git commit c0f3cf142 before 08c3f93d.
How severe is CVE-2026-11859?: CVE-2026-11859 has a CVSS 4.0 base score of 2.0, rated low severity.
Is CVE-2026-11859 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.
How do I fix CVE-2026-11859?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-11859 have an EU (EUVD) identifier?: Yes. CVE-2026-11859 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36001.
When was CVE-2026-11859 published?: CVE-2026-11859 was published on 2026-06-10 and last updated on 2026-06-17.

References

https://github.com/thinkst/canarytokens/security/advisories/GHSA-55jf-cqr9-r7p4

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