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Vulnerability record · CVE-2026-78834 · published 8 September 2026

CVE-2026-78834: Code injection vulnerability

A code execution vulnerability exists in CMSimple 5.22 in the CoAuthors plugin. An authenticated low-privileged user who can modify page content and provide controlled imported content can trigger server-side execution by referencing crafted external or uploaded text content through the affected content import feature.

8.8 CVSS 3.1 High EPSS 0.67% · top 50.2% CWE-94 · Code injection Deferred
8.8CVSS 3.1 base score
0.67%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
9 Sep 2026Last modified by NVD

Description

A code execution vulnerability exists in CMSimple 5.22 in the CoAuthors plugin. An authenticated low-privileged user who can modify page content and provide controlled imported content can trigger server-side execution by referencing crafted external or uploaded text content through the affected content import feature.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
https://gist.github.com/AEQ3/574cb644306776a9ff1a0de30b085e62
https://github.com/AEQ3/CVE/issues/1

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Source: NIST National Vulnerability Database (record CVE-2026-78834), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.