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Advisory record · GHSA-8535-hvm8-2hmv

Grav is vulnerable to Server-Side Template Injection (SSTI) via Forms

CVSS 7.7 HighEPSS 0.0040 · 35th percentile

Published by the GitHub Advisory Database at 2 Dec 2025, 01:25 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
getgrav/gravPackagist<1.8.0-beta.271.8.0-beta.27
Identifiers
GHSA-8535-hvm8-2hmv · CVE-2025-66298 · PKSA-b17c-1fcn-dgtx
Weakness (CWE)
CWE-1336
Tags
Published
2 Dec 2025
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Grav versions before 1.8.0-beta.27 are affected by a Server-Side Template Injection issue involving forms. An attacker who can submit a POST request to a site's form can use a crafted template expression in a form field to get the server to output the full Grav configuration, including plugin settings that may contain sensitive data. The fix is to upgrade Grav to 1.8.0-beta.27 or later.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.7 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0040, the 35th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:03 UTC First seen by agentprime
  2. 31 Oct 2026, 14:03 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.