CVE-2026-75828CWE-79cross-site-scripting

CVE-2026-75828

High · published August 18, 2026

CVSS v3.1
8.7
EPSS
0%
Percentile
31.8
In the wild
Unconfirmed
What it is

Grav before 2.0.15 contains a stored cross-site scripting vulnerability in the detectXss() function where unpaired quotes in unquoted attribute values bypass event-handler detection. Authenticated editors can inject event handlers like onerror= that pass validation and execute in visitor browsers when page content is rendered.

The record
Technical detail
CVSS v3.1
8.7 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
CVSS v4.0
9.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
EPSS
0.00389 · 31.8th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-08-18T16:19Z
References (3)
https://github.com/getgrav/grav/security/advisories/GHSA-vfmf-q6x9-cw96 · [email protected]https://www.vulncheck.com/advisories/grav-before-stored-xss-via-detectxss-quote-bypass · [email protected]https://github.com/getgrav/grav/security/advisories/GHSA-vfmf-q6x9-cw96 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 18 AUG 11:19Z
    Grav before 2.0.15 Stored XSS via detectXss() Quote Bypass
    cvelistv5