CVE-2026-75828

critical · 9.3

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.

9.3

CVSS

0.4%

EPSS (exploit prob.)

33rd

EPSS percentile

2026-08-18

Published

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE-79

References

https://github.com/getgrav/grav/security/advisories/GHSA-vfmf-q6x9-cw96
https://www.vulncheck.com/advisories/grav-before-stored-xss-via-detectxss-quote-bypass
https://github.com/getgrav/grav/security/advisories/GHSA-vfmf-q6x9-cw96

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-75828