CVE-2026-107903

validatedZero produced an exploit or a check.

GHSA-6369-7rq9-5hm6 ↗EUVD-2026-117627 ↗

check availableZero validated a working check for it.not proven exploitableZero has a detection check, but hasn't produced a full working exploit yet.
cve.orgpublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).kevAttacks confirmed in the real world.
balbooa.com Gridbox extension for Joomla 1.0.0-2.20.4.2
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
ETK-2026-3657Zero's internal tracking ID, independent of the CVE number., permanent identifier
+1h12mTTV
53mAI analysisAnalysis: how long the AI spent reversing this signal.
Check if you are vulnerable
timeline
0 = cve.org publication
trigger signal (cve.org) +0mcheck available+72magent stopped
0
+15min
+30min
+45min
+60min

description

Gridbox for Joomla versions before 2.20.5.0 are affected by a stored cross-site scripting flaw in review content. An attacker able to submit crafted review data may cause script to run when that stored content is viewed.

mitigation

Upgrade the Gridbox extension to version 2.20.5.0 or later. Until upgraded, restrict who can submit or manage reviews and avoid viewing untrusted review content in privileged sessions.

check
available
exploit
no
automationDeterministic: a check that runs on its own, the same request on every target. Contextual: an agentic technique that needs to be applied per target, for bugs that depend on contextual flows.
contextual
auth requiredWhether an attacker needs an account first, based on the CVSS vector's Privileges Required.
no
EPSSEstimate of the chance this CVE is exploited in the next 30 days. Refreshed daily.
–
agent run time
53m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-11-05 17:56Z
Δ to public pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).
–
Δ to kevAttacks confirmed in the real world.
–

outcome

Contextual check: a technique exists and was validated, but no deterministic check could cover this one.

source signals

Public signals that triggered or updated the pipeline. These are inputs for the deltas above.

  1. 2026-11-05 17:56Z
    cve_org: trigger signal, started the run

this entry in the feed

GET /api/v1/feed/CVE-2026-107903

{
  "etk_id": "ETK-2026-3657",
  "cve_id": "CVE-2026-107903",
  "display_id": "CVE-2026-107903",
  "ghsa_id": "GHSA-6369-7rq9-5hm6",
  "euvd_id": "EUVD-2026-117627",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Stored cross-site scripting in Gridbox reviews",
  "summary": "Gridbox for Joomla versions before 2.20.5.0 are affected by a stored cross-site scripting flaw in review content. An attacker able to submit crafted review data may cause script to run when that stored content is viewed.",
  "mitigation": "Upgrade the Gridbox extension to version 2.20.5.0 or later. Until upgraded, restrict who can submit or manage reviews and avoid viewing untrusted review content in privileged sessions.",
  "vendor": "balbooa.com",
  "product": "Gridbox extension for Joomla",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "1.0.0-2.20.4.2"
      ],
      "ecosystem": null,
      "fixed_versions": [],
      "package_name": "com_gridbox",
      "purl": null
    }
  ],
  "cwes": [
    79
  ],
  "cvss_score": 8.6,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "assessed",
  "exploit": false,
  "pipeline_minutes": 52.89396598333333,
  "t0_at": "2026-11-05T17:56:53.843000+00:00",
  "signals": {
    "check": {
      "at": "2026-11-05T19:09:01.309855+00:00",
      "days": 0.05008642193287037,
      "is_lower_bound": false,
      "measured_at": "2026-11-05T17:56:53.843000+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-11-05T17:56:53.843000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-11-05T17:56:53.843000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-107903"
    }
  }
}

published 2026-11-05 18:16Z
last change 2026-11-05 22:29Z

Need the technical details behind an entry?

Every entry here shows what we attempted and when. The technical details, the generated exploit that fired it and the evidence behind the verdict are not public. Tell us about your use case and we’ll get back to you about extended API access.