CVE-2026-61453
Grav v2.0.0 contains a cross-site scripting vulnerability (fixed in 2.0.1).
Impact
Grav v2.0.0 contains a cross-site scripting vulnerability (fixed in 2.0.1). The XSS blueprint validator (Security::detectXss()) runs on raw page content before Twig processing. When Twig content processing is enabled (twig_content.process_enabled: true), an attacker with page-write API permission can use Twig's string concatenation operator (~) to dynamically construct event handler names, dangerous tag names, or dangerous protocols at render time (e.g. {% set x = "on" ~ "error" %}). The validator sees only the harmless Twig expression and allows the content, but after Twig rendering the output (rendered via {{ page.content|raw }}) contains an active payload such as <img src=1 onerror=alert(1)>, executing arbitrary JavaScript in visitors' browsers.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | getgrav/grav | = 2.0.0 | 2.0.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-2c4f-86xc-cr74
- https://github.com/getgrav/grav/security/advisories/GHSA-2c4f-86xc-cr74
- https://nvd.nist.gov/vuln/detail/CVE-2026-61453
- https://nvd.nist.gov/vuln/detail/CVE-2026-61710
- https://www.vulncheck.com/advisories/grav-before-xss-via-twig-string-concatenation