What is CVE-2026-75831?

CVE-2026-75831 is a high-severity vulnerability in Getgrav Grav, classified under Cross-site Scripting. CVSS score: 7.6/10. Published 2026-08-18.

How severe is CVE-2026-75831?

High severity. CVSS v3 base score is 7.6 out of 10.

XSS in Getgrav Grav

CVE-2026-75831

Grav before 2.0.15 contains a stored cross-site scripting vulnerability in the audio and video media rendering through the sourceParsedownElement method. The media URL fragment is concatenated unescaped into rawHtml source elements, allowing attackers to inject arbitrary HTML and JavaScript that executes in viewers' sessions.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N.

Affected products

Getgrav Grav

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-75831?: CVE-2026-75831 is a high-severity vulnerability in Getgrav Grav, classified under Cross-site Scripting. CVSS score: 7.6/10. Published 2026-08-18.
How severe is CVE-2026-75831?: High severity. CVSS v3 base score is 7.6 out of 10.