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Vulnerability record · CVE-2026-75828 · published 18 August 2026

CVE-2026-75828: Cross-site scripting vulnerability

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 4.0 Critical EPSS 0.39% · top 69.6% CWE-79 · Cross-site scripting Deferred
9.3CVSS 4.0 base score
0.39%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
8 Sep 2026Last modified by NVD

Description

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.

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:

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-75828), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.