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 verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 5.6%CVSS: 9.8Exploit: Elevated riskExposed services: Not assessed

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

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
9.8CRITICALmedium confidence
EG Risk
75
EG Risk 75/100CISA SSVC

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%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
5.6%
EPSS %ILE
92nd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 27, 2026

Last Modified

August 7, 2026

Advisory Details (4)

Auto-updated Oct 9, 2026
🔬 Proof of concept available. No fix on record 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 10× in last 7d / 93× 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 407 total refreshes for this CVE.

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

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 ↗

Related CVEs(same CWE)

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 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 5.6% probability of exploitation in the next 30 days (92nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-61511?
CVE-2026-61511 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-61511?
No fix for CVE-2026-61511 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-61511 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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