How severe is CVE-2026-24907?

CVE-2026-24907 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-24907 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-24907?

CVE-2026-24907 affects Octobercms October. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-24907?

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

Does CVE-2026-24907 have an EU (EUVD) identifier?

Yes. CVE-2026-24907 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-22660.

When was CVE-2026-24907 published?

CVE-2026-24907 was published on 2026-04-14 and last updated on 2026-06-17.

CVE-2026-24907

CVE-2026-24907 is a medium-severity vulnerability in Octobercms October with a CVSS 3.x base score of 5.4. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v4: 5.1
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-22660
Weakness: CWE-79
Affected product: Octobercms October
Published: 2026-04-14
Last modified: 2026-06-17

Description

October is a Content Management System (CMS) and web platform. Versions prior to 3.7.14 and 4.1.10 contain a stored cross-site scripting (XSS) vulnerability in the Event Log mail preview feature. When viewing logged mail messages, HTML content was rendered in an iframe without proper sandboxing, allowing JavaScript execution in the viewer's browser context. This issue has been fixed in versions 3.7.14 and 4.1.10. If users are unable to update immediately, workarounds include restricting mail template editing permissions to fully trusted administrators only and restricting Event Log viewing permissions to minimize exposure.

Frequently asked questions

What is CVE-2026-24907?: October is a Content Management System (CMS) and web platform. Versions prior to 3.7.14 and 4.1.10 contain a stored cross-site scripting (XSS) vulnerability in the Event Log mail preview feature. When viewing logged mail messages, HTML content was rendered in an iframe without proper sandboxing, allowing JavaScript execution in the viewer's browser context. This issue has been fixed in versions 3.7.14 and 4.1.10. If users are unable to update immediately, workarounds include restricting mail template editing permissions to fully trusted administrators only and restricting Event Log viewing permissions to minimize exposure.
How severe is CVE-2026-24907?: CVE-2026-24907 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-24907 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-24907?: CVE-2026-24907 affects Octobercms October. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-24907?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-24907 have an EU (EUVD) identifier?: Yes. CVE-2026-24907 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-22660.
When was CVE-2026-24907 published?: CVE-2026-24907 was published on 2026-04-14 and last updated on 2026-06-17.

References

https://github.com/octobercms/october/security/advisories/GHSA-j4j5-9x6g-rgxc

Affected products (1)

cpe:2.3:a:octobercms:october:*:*:*:*:*:*:*:*

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