CVE-2026-61511

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-27. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
9.8EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 71%
CISA-KEV: Not listedEPSS PROB: 71%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

vBulletin 5.x through 5.7.5 and 6.x through 6.2.1 contains an eval injection vulnerability in the vB5_Template_Runtime::runMaths() method within the template runtime that allows unauthenticated remote attackers to execute arbitrary PHP code by supplying crafted input through the pagenav[pagenumber] parameter. Attackers can exploit the insufficiently restrictive regex filter by using phpfuck-style encoding with permitted characters to inject and execute arbitrary PHP code via the unauthenticated ajax/render template route without any authentication.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
87(Track)
EG Risk 87/100SSVC: Track

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
Severity98% × 45%
Exploitation71% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
71%
EPSS %ILE
99%
KEV
Not listed

Published

July 27, 2026

Last Modified

August 7, 2026

Advisory Details (4)

Auto-updated Sep 18, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Full Disclosure: [KIS-2026-13] vBulletin <= 6.2.1 (runMaths) Remote Code Execution Vulnerability

http://seclists.org/fulldisclosure/2026/Aug/29
generic

vBulletin < 6.2.2 Eval Injection RCE via vb5/template/runtime.php | Advisories | VulnCheck

https://www.vulncheck.com/advisories/vbulletin-eval-injection-rce-via-vb5-template-runtime-php
generic

vBulletin Runtime Template runMaths Preauth RCE - SSD Secure Disclosure

https://ssd-disclosure.com/vbulletin-runtime-template-runmaths-preauth-rce/
generic🟡 PoC Available

vBulletin <= 6.2.1 (runMaths) Remote Code Execution Vulnerability | Karma(In)Security

https://karmainsecurity.com/KIS-2026-13

Vendor Advisories for CVE-2026-61511(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 35× in last 7d / 147× 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.

Showing the most recent 100 of 361 total refreshes for this CVE.

  1. 2026-09-19 08:22 UTCGHSA enrichment
  2. 2026-09-18 22:43 UTCEG score recompute
  3. 2026-09-18 22:43 UTCGHSA enrichment
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 18:59 UTCGHSA enrichment
  6. 2026-09-18 10:01 UTCGHSA enrichment
  7. 2026-09-18 06:17 UTCGHSA enrichment
  8. 2026-09-18 02:33 UTCEG score recompute
  9. 2026-09-18 02:33 UTCGHSA enrichment
  10. 2026-09-17 09:16 UTCGHSA enrichment
  11. 2026-09-17 05:32 UTCGHSA enrichment
  12. 2026-09-17 01:47 UTCEG score recompute
  13. 2026-09-17 01:47 UTCGHSA enrichment
  14. 2026-09-16 14:08 UTCEPSS rescore
  15. 2026-09-16 11:54 UTCGHSA enrichment
  16. 2026-09-16 06:17 UTCEG score recompute
  17. 2026-09-16 06:17 UTCGHSA enrichment
  18. 2026-09-16 05:15 UTCEPSS rescore
  19. 2026-09-15 09:13 UTCEG score recompute
  20. 2026-09-15 09:13 UTCGHSA enrichment
  21. 2026-09-14 16:00 UTCGHSA enrichment
  22. 2026-09-14 12:15 UTCGHSA enrichment
  23. 2026-09-14 08:27 UTCGHSA enrichment
  24. 2026-09-14 04:41 UTCGHSA enrichment
  25. 2026-09-14 00:57 UTCGHSA enrichment
Show 75 more
  1. 2026-09-13 21:13 UTCGHSA enrichment
  2. 2026-09-13 15:22 UTCGHSA enrichment
  3. 2026-09-13 11:20 UTCGHSA enrichment
  4. 2026-09-13 07:34 UTCGHSA enrichment
  5. 2026-09-13 03:50 UTCGHSA enrichment
  6. 2026-09-13 00:05 UTCGHSA enrichment
  7. 2026-09-12 20:20 UTCGHSA enrichment
  8. 2026-09-12 16:34 UTCEG score recompute
  9. 2026-09-12 16:34 UTCGHSA enrichment
  10. 2026-09-12 12:34 UTCGHSA enrichment
  11. 2026-09-12 08:50 UTCGHSA enrichment
  12. 2026-09-12 04:55 UTCGHSA enrichment
  13. 2026-09-12 00:45 UTCGHSA enrichment
  14. 2026-09-11 19:38 UTCGHSA enrichment
  15. 2026-09-11 15:53 UTCEG score recompute
  16. 2026-09-11 15:53 UTCGHSA enrichment
  17. 2026-09-11 14:53 UTCEPSS rescore
  18. 2026-09-11 09:37 UTCEPSS rescore
  19. 2026-09-11 07:07 UTCGHSA enrichment
  20. 2026-09-11 02:02 UTCGHSA enrichment
  21. 2026-09-10 20:49 UTCGHSA enrichment
  22. 2026-09-10 14:40 UTCGHSA enrichment
  23. 2026-09-10 10:18 UTCEG score recompute
  24. 2026-09-10 10:17 UTCGHSA enrichment
  25. 2026-09-10 09:35 UTCEPSS rescore
  26. 2026-09-09 12:11 UTCGHSA enrichment
  27. 2026-09-09 08:24 UTCEG score recompute
  28. 2026-09-09 08:24 UTCGHSA enrichment
  29. 2026-09-08 22:01 UTCEPSS rescore
  30. 2026-09-08 00:49 UTCGHSA enrichment
  31. 2026-09-07 21:04 UTCGHSA enrichment
  32. 2026-09-06 23:31 UTCGHSA enrichment
  33. 2026-09-06 15:39 UTCEG score recompute
  34. 2026-09-06 15:39 UTCGHSA enrichment
  35. 2026-09-06 13:47 UTCEPSS rescore
  36. 2026-09-06 11:30 UTCGHSA enrichment
  37. 2026-09-06 07:46 UTCGHSA enrichment
  38. 2026-09-06 02:45 UTCGHSA enrichment
  39. 2026-09-05 23:01 UTCGHSA enrichment
  40. 2026-09-05 19:16 UTCEG score recompute
  41. 2026-09-05 19:16 UTCGHSA enrichment
  42. 2026-09-05 09:31 UTCGHSA enrichment
  43. 2026-09-05 05:47 UTCGHSA enrichment
  44. 2026-09-04 16:22 UTCEG score recompute
  45. 2026-09-04 16:22 UTCGHSA enrichment
  46. 2026-09-04 12:33 UTCEG score recompute
  47. 2026-09-04 12:33 UTCGHSA enrichment
  48. 2026-09-04 05:07 UTCEPSS rescore
  49. 2026-09-02 14:12 UTCEPSS rescore
  50. 2026-09-01 23:00 UTCGHSA enrichment
  51. 2026-08-31 05:52 UTCGHSA enrichment
  52. 2026-08-31 02:07 UTCGHSA enrichment
  53. 2026-08-30 22:23 UTCEG score recompute
  54. 2026-08-30 22:23 UTCGHSA enrichment
  55. 2026-08-30 19:17 UTCEPSS rescore
  56. 2026-08-30 18:39 UTCGHSA enrichment
  57. 2026-08-30 14:55 UTCGHSA enrichment
  58. 2026-08-30 11:11 UTCGHSA enrichment
  59. 2026-08-30 07:26 UTCGHSA enrichment
  60. 2026-08-30 03:40 UTCGHSA enrichment
  61. 2026-08-29 23:55 UTCEG score recompute
  62. 2026-08-29 23:55 UTCGHSA enrichment
  63. 2026-08-28 21:42 UTCEPSS rescore
  64. 2026-08-28 01:27 UTCGHSA enrichment
  65. 2026-08-27 21:02 UTCEG score recompute
  66. 2026-08-27 21:02 UTCGHSA enrichment
  67. 2026-08-27 14:25 UTCEPSS rescore
  68. 2026-08-27 13:28 UTCGHSA enrichment
  69. 2026-08-27 09:44 UTCGHSA enrichment
  70. 2026-08-27 03:14 UTCGHSA enrichment
  71. 2026-08-26 23:30 UTCGHSA enrichment
  72. 2026-08-26 19:46 UTCEG score recompute
  73. 2026-08-26 19:46 UTCGHSA enrichment
  74. 2026-08-26 14:46 UTCEPSS rescore
  75. 2026-08-26 14:24 UTCGHSA enrichment

Publicly available exploits

(3 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCtc4dy/CVE-2026-61511-PoC-Exploit
    First seen Jul 29, 2026

    CVE-2026-61511 – vBulletin Pre-Auth RCE (CVSS 9.8). Vuln 5.x/6.x (unpatched). Multi-exploit via Endpoint Pool, AJAX, PHPFuck WAF bypass. Full toolkit: reverse shell, proxy, persistence, webshell, database operations, firewall control, log management, mass scanning. 2 versions: multi-exploit & safe-check. Python 3.8+ Use Ethically, Stay Legal. 🔒

    Open source ↗
  • GitHub PoCpuj790201-lab/cve-2026-61511
    First seen Jul 28, 2026

    cve-2026-61511

    Open source ↗
  • Nucleihttp/cves/2026/CVE-2026-61511.yaml
    First seen Jan 1, 2026

    vBulletin 6.x - Remote Code Execution

    Open source ↗

Frequently asked(5)

What is CVE-2026-61511?
CVE-2026-61511 is a critical vulnerability published on July 27, 2026. vBulletin 5.x through 5.7.5 and 6.x through 6.2.1 contains an eval injection vulnerability in the vB5TemplateRuntime::runMaths() method within the template runtime that allows unauthenticated remote attackers to execute arbitrary PHP code by supplying crafted input through the pagenav[pagenumber]…
When was CVE-2026-61511 disclosed?
CVE-2026-61511 was first published in the National Vulnerability Database on July 27, 2026, with the most recent update on August 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-61511 actively exploited?
CVE-2026-61511 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 71% probability of exploitation in the next 30 days, which ranks it in the top 0.6% of all scored CVEs.
What is the CVSS score of CVE-2026-61511?
CVE-2026-61511 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-61511?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-61511, 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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