How severe is CVE-2026-12888?

CVE-2026-12888 has a CVSS 4.0 base score of 2.0, rated low severity.

Is CVE-2026-12888 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-12888?

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

Does CVE-2026-12888 have an EU (EUVD) identifier?

Yes. CVE-2026-12888 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38240.

When was CVE-2026-12888 published?

CVE-2026-12888 was published on 2026-06-22 and last updated on 2026-06-23.

CVE-2026-12888

CVE-2026-12888 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% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38240
Weakness: CWE-74
Published: 2026-06-22
Last modified: 2026-06-23

Description

An HTML injection vulnerability exists in the Google Chat webhook notification sent by Thinkst Applied Research Canarytokens, enabling Interface Manipulation in Google Chat. An attacker can insert limited HTML content including links. This issue affects Canarytokens: from Docker tag sha-4aef1db90 before sha-8ab4dccd, from Git commit 4aef1db90 before 8ab4dccd.

Frequently asked questions

What is CVE-2026-12888?: An HTML injection vulnerability exists in the Google Chat webhook notification sent by Thinkst Applied Research Canarytokens, enabling Interface Manipulation in Google Chat. An attacker can insert limited HTML content including links. This issue affects Canarytokens: from Docker tag sha-4aef1db90 before sha-8ab4dccd, from Git commit 4aef1db90 before 8ab4dccd.
How severe is CVE-2026-12888?: CVE-2026-12888 has a CVSS 4.0 base score of 2.0, rated low severity.
Is CVE-2026-12888 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-12888?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-12888 have an EU (EUVD) identifier?: Yes. CVE-2026-12888 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38240.
When was CVE-2026-12888 published?: CVE-2026-12888 was published on 2026-06-22 and last updated on 2026-06-23.

References

https://github.com/thinkst/canarytokens/security/advisories/GHSA-vcfc-7466-8q65

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