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)

Published 2026-08-18 · last modified 2026-09-08.

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.

EPSS exploit prediction

EPSS: 0.004 (26.3th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001

Affected products

Getgrav Grav

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/getgrav/grav/security/advisories/GHSA-6qw9-4vv5-jr97 (vendor-advisory)
github.com/getgrav/grav/commit/aba291a59cab29ddce491175791888d8d0b65e20 (patch)
www.vulncheck.com/advisories/grav-before-stored-xss-via-audio-video-source-url (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.