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 76% 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
Elevated
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
24%
KEV
Not listed

Published

August 21, 2026

Last Modified

August 27, 2026

Advisory Details (4)

Auto-updated Sep 15, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_pr, github_release, github.
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
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_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_commit

commit e434061be3b7 (phalcon/cphalcon)

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

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

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 13× in last 7d / 55× 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. 2026-09-18 21:37 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-17 21:16 UTCEG score recompute
  4. 2026-09-17 19:31 UTCEPSS rescore
  5. 2026-09-16 14:19 UTCEG score recompute
  6. 2026-09-16 14:08 UTCEPSS rescore
  7. 2026-09-16 05:58 UTCEG score recompute
  8. 2026-09-16 05:15 UTCEPSS rescore
  9. 2026-09-15 06:18 UTCEG score recompute
  10. 2026-09-15 03:11 UTCEPSS rescore
  11. 2026-09-13 20:18 UTCEG score recompute
  12. 2026-09-13 16:47 UTCEPSS rescore
  13. 2026-09-12 18:10 UTCEG score recompute
  14. 2026-09-11 15:50 UTCEG score recompute
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-11 12:06 UTCEG score recompute
  17. 2026-09-10 12:12 UTCEG score recompute
  18. 2026-09-10 09:35 UTCEPSS rescore
  19. 2026-09-09 01:45 UTCEG score recompute
  20. 2026-09-08 22:01 UTCEPSS rescore
  21. 2026-09-07 19:38 UTCEG score recompute
  22. 2026-09-07 16:01 UTCEPSS rescore
  23. 2026-09-06 17:02 UTCEG score recompute
  24. 2026-09-06 13:47 UTCEPSS rescore
  25. 2026-09-05 18:33 UTCEG score recompute
Show 30 more
  1. 2026-09-04 15:06 UTCEG score recompute
  2. 2026-09-04 07:37 UTCEG score recompute
  3. 2026-09-04 05:07 UTCEPSS rescore
  4. 2026-09-02 15:48 UTCEG score recompute
  5. 2026-09-02 14:12 UTCEPSS rescore
  6. 2026-09-01 16:46 UTCEG score recompute
  7. 2026-09-01 13:54 UTCEPSS rescore
  8. 2026-09-01 05:25 UTCEG score recompute
  9. 2026-09-01 04:40 UTCEPSS rescore
  10. 2026-08-30 22:18 UTCEG score recompute
  11. 2026-08-30 19:17 UTCEPSS rescore
  12. 2026-08-30 03:34 UTCEG score recompute
  13. 2026-08-30 01:22 UTCEPSS rescore
  14. 2026-08-29 01:05 UTCEG score recompute
  15. 2026-08-28 21:42 UTCEPSS rescore
  16. 2026-08-27 16:25 UTCEG score recompute
  17. 2026-08-27 14:25 UTCEPSS rescore
  18. 2026-08-26 17:54 UTCEG score recompute
  19. 2026-08-26 14:46 UTCEPSS rescore
  20. 2026-08-25 15:39 UTCEG score recompute
  21. 2026-08-25 13:49 UTCEPSS rescore
  22. 2026-08-25 08:11 UTCEG score recompute
  23. 2026-08-25 04:23 UTCEG score recompute
  24. 2026-08-24 16:56 UTCEG score recompute
  25. 2026-08-24 12:54 UTCEG score recompute
  26. 2026-08-23 03:18 UTCEG score recompute
  27. 2026-08-23 00:19 UTCEPSS rescore
  28. 2026-08-21 21:24 UTCEG score recompute
  29. 2026-08-21 20:34 UTCEG score recompute
  30. 2026-08-21 20:34 UTCMITRE cvelistV5first tracked

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 27, 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 75.6% 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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