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Advisory record · GHSA-6qw9-4vv5-jr97

Grav: Stored XSS via Markdown audio/video media <source> URL

CVSS 5.1 MediumEPSS 0.0035 · 29th percentile

Published by the GitHub Advisory Database at 17 Sept 2026, 17:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
getgrav/gravPackagist<2.0.152.0.15
Identifiers
GHSA-6qw9-4vv5-jr97 · CVE-2026-75831 · PKSA-12j4-4z12-p48k
Weakness (CWE)
CWE-79
Tags
Published
17 Sept 2026
Updated
17 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Grav versions before 2.0.15 are affected by a stored cross-site scripting flaw in the audio and video Markdown embed code, where the media URL fragment is placed unescaped into a raw HTML source element. An attacker with page-edit rights can embed a crafted audio or video reference so that script runs in the browser of anyone who views the page, including a logged-in administrator. The fix is to upgrade Grav to 2.0.15, which is listed as the fixed version.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.1 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0035, the 29th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 13:56 UTC First seen by agentprime
  2. 31 Oct 2026, 13:56 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.