CVE-2026-42611: Grav: Stored XSS via Tag Injection

Severity: high (CVSS 8.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-05-11 · updated 2026-10-26
Weakness: CWE-79

Description

Grav is a file-based Web platform. Prior to 2.0.0-beta.2, a low-privileged (with the ability to create a page) user can cause XSS with the injection of svg element. The XSS can further be escalated to dump the entire system information available under /admin/config/info whenever a Super Admin visits the page; which can further be chained with the use of admin-nonce to do a complete server compromise (RCE). This vulnerability is fixed in 2.0.0-beta.2.

Affected products

getgrav grav: through 1.8.0; 2.0.0-beta1

References

https://github.com/getgrav/grav/commit/5a12f9be8314682c8713e569e330f11805d0a663
https://github.com/getgrav/grav/security/advisories/GHSA-w8cg-7jcj-4vv2
https://github.com/getgrav/grav/security/advisories/GHSA-w8cg-7jcj-4vv2

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