CVE-2026-59989

CRITICALPre-NVD 9.29.2—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 77% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this weekElevated
9.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.2Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Phalcon is a high-performance, full-stack PHP framework. In 5.15.0 and earlier, resolveFilter in phalcon/Mvc/View/Engine/Volt/Compiler.zep builds the join filter by inserting the raw separator and array token values into generated PHP without passing them through expression(). An attacker who can influence Volt template source can place quote-breaking content in a join argument, inject PHP into the compiled cache file, and execute it when Phalcon\Mvc\View\Engine\Volt::render() loads the template. This issue is fixed in version 5.16.0.

CVSS v3
9.2
EG Score
9.2(medium)
EG Risk
72(Attend)
EG Risk 72/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity92% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

August 21, 2026

Last Modified

August 25, 2026

Advisory Details (4)

Auto-updated Aug 21, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available

v5.16.0

Patch available: phalcon/cphalcon v5.16.0

https://github.com/phalcon/cphalcon/releases/tag/v5.16.0
github_commit

commit e434061be3b7 (phalcon/cphalcon)

Fix landed in phalcon/cphalcon commit e434061be3b7 — awaiting tagged release

https://github.com/phalcon/cphalcon/commit/e434061be3b7161930476c1368c868badc71e1bd
github_pr

5.16.0 release

Fix merged in phalcon/cphalcon PR #17217 on 2026-06-22 — awaiting tagged release

https://github.com/phalcon/cphalcon/pull/17217
github Patch Available🟡 PoC Available

Phalcon Volt compiler `join` filter compile-time PHP code injection (SSTI lead to RCE) · Advisory · phalcon/cphalcon · GitHub

https://github.com/phalcon/cphalcon/security/advisories/GHSA-hrwp-4hh9-c8r8

Vendor Advisories for CVE-2026-59989(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
phalcon/cphalcon5.10.0 ... v5.8.0 (97 versions)5.16.0—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 11× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-25 15:39 UTCEG score recompute
  2. 2026-08-25 13:49 UTCEPSS rescore
  3. 2026-08-25 08:11 UTCEG score recompute
  4. 2026-08-25 04:23 UTCEG score recompute
  5. 2026-08-24 16:56 UTCEG score recompute
  6. 2026-08-24 12:54 UTCEG score recompute
  7. 2026-08-23 03:18 UTCEG score recompute
  8. 2026-08-23 00:19 UTCEPSS rescore
  9. 2026-08-21 21:24 UTCEG score recompute
  10. 2026-08-21 20:34 UTCEG score recompute
  11. 2026-08-21 20:34 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-59989?
CVE-2026-59989 is a critical vulnerability published on August 21, 2026. Phalcon is a high-performance, full-stack PHP framework. In 5.15.0 and earlier, resolveFilter in phalcon/Mvc/View/Engine/Volt/Compiler.zep builds the join filter by inserting the raw separator and array token values into generated PHP without passing them through expression(). An attacker who can…
When was CVE-2026-59989 disclosed?
CVE-2026-59989 was first published in the National Vulnerability Database on August 21, 2026, with the most recent update on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59989 actively exploited?
CVE-2026-59989 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 76.5% of all scored CVEs.
What is the CVSS score of CVE-2026-59989?
CVE-2026-59989 has a CVSS v3 base score of 9.2 (NVD).
How do I remediate CVE-2026-59989?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59989, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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