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Advisory record · GHSA-hrwp-4hh9-c8r8

Phalcon Volt compiler `join` filter compile-time PHP code injection (SSTI leads to RCE)

CVSS 9.2 CriticalCriticalEPSS 0.0054 · 46th percentile

Critical, because:

  • CVSS score 9.2: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 21 Aug 2026, 20:55 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
phalcon/cphalconPackagist<5.16.05.16.0
Identifiers
GHSA-hrwp-4hh9-c8r8 · CVE-2026-59989 · PKSA-n2s8-x5tr-m78t
Weakness (CWE)
CWE-94 · CWE-1336
Tags
Published
21 Aug 2026
Updated
11 Sept 2026

Machine-written summary

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

The Volt template compiler in phalcon/cphalcon versions before 5.16.0 does not escape the separator and array arguments of the `join` filter when generating PHP, so they can break out of the generated code. An attacker who can supply Volt template source to an application that compiles it can inject arbitrary PHP, which runs when the compiled template is rendered, leading to remote code execution. Upgrade to phalcon/cphalcon 5.16.0 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
9.2 Critical 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0054, the 46th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 13:56 UTC First seen by agentprime
  2. 31 Oct 2026, 13:56 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.