How severe is CVE-2026-45243?

CVE-2026-45243 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-45243 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-45243?

CVE-2026-45243 affects Steipete Summarize. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-45243?

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

Does CVE-2026-45243 have an EU (EUVD) identifier?

Yes. CVE-2026-45243 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30794.

When was CVE-2026-45243 published?

CVE-2026-45243 was published on 2026-05-18 and last updated on 2026-06-17.

CVE-2026-45243

CVE-2026-45243 is a medium-severity vulnerability in Steipete Summarize with a CVSS 3.x base score of 6.1. 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 3.x base score 6.1)
CVSS v4: 5.3
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-30794
Weakness: CWE-862
Affected product: Steipete Summarize
Published: 2026-05-18
Last modified: 2026-06-17

Description

Summarize prior to 0.15.1 contains a missing authorization vulnerability in the content script window.postMessage bridge that allows malicious pages to perform unauthorized operations on automation artifacts. Attackers can simulate runtime messages with spoofed sender identifiers to list, read, create, overwrite, or delete automation artifacts scoped to the affected tab without proper authorization checks.

Frequently asked questions

What is CVE-2026-45243?: Summarize prior to 0.15.1 contains a missing authorization vulnerability in the content script window.postMessage bridge that allows malicious pages to perform unauthorized operations on automation artifacts. Attackers can simulate runtime messages with spoofed sender identifiers to list, read, create, overwrite, or delete automation artifacts scoped to the affected tab without proper authorization checks.
How severe is CVE-2026-45243?: CVE-2026-45243 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-45243 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-45243?: CVE-2026-45243 affects Steipete Summarize. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-45243?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-45243 have an EU (EUVD) identifier?: Yes. CVE-2026-45243 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30794.
When was CVE-2026-45243 published?: CVE-2026-45243 was published on 2026-05-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:steipete:summarize:*:*:*:*:*:*:*:*

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