CVE-2026-93873

MEDIUMPre-NVD 4.34.3
EchelonGraph scoreLOW confidence

This medium-severity CVE scores 4.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). 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: secondary
Elevated
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 4.3Exploit: Elevated riskExposed: 0

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

Cotonti through 1.0.0 fails to validate anti-CSRF tokens in the contact plugin submission handler, allowing attackers to forge messages. Attackers can auto-submit contact forms from attacker-controlled pages to send forged messages attributed to authenticated victims to the administrator inbox.

CVSS v3
4.3
EG Score
4.3(low)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity43% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
—
EPSS %ILE
—
KEV
Not listed

Published

September 18, 2026

Last Modified

September 18, 2026

Advisory Details (5)

Auto-updated Sep 18, 2026
🔬 Proof of concept available. No patch confirmed yet. Sources: github_pr.
generic

Cotonti through 1.0.0 Cross-Site Request Forgery in the Contact Plugin | Advisories | VulnCheck

https://www.vulncheck.com/advisories/cotonti-through-1.0.0-cross-site-request-forgery-in-the-contact-plugin
generic

GitHub - Cotonti/Cotonti: Fast, reliable and flexible PHP CMF/CMS · GitHub

https://github.com/Cotonti/Cotonti
generic

Cotonti/plugins/contact/contact.php at 1.0.0 · Cotonti/Cotonti · GitHub

https://github.com/Cotonti/Cotonti/blob/1.0.0/plugins/contact/contact.php
github_pr

security: add CSRF guard to contact form handler (CWE-352)

Upstream fix in progress (PR #1903 · Cotonti/Cotonti, state=open)

https://github.com/Cotonti/Cotonti/pull/1903
generic🟡 PoC Available

[Security] CSRF on contact form — missing cot_check_xg() allows forged email submissions (CWE-352) · Issue #1895 · Cotonti/Cotonti · GitHub

https://github.com/Cotonti/Cotonti/issues/1895

Vendor Advisories for CVE-2026-93873(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 4× in last 7d / 4× 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 21:28 UTCEG score recompute
  2. 2026-09-18 20:27 UTCEG score recompute
  3. 2026-09-18 19:59 UTCEG score recompute
  4. 2026-09-18 19:59 UTCMITRE cvelistV5first tracked

Frequently asked(4)

What is CVE-2026-93873?
CVE-2026-93873 is a medium vulnerability published on September 18, 2026. Cotonti through 1.0.0 fails to validate anti-CSRF tokens in the contact plugin submission handler, allowing attackers to forge messages. Attackers can auto-submit contact forms from attacker-controlled pages to send forged messages attributed to authenticated victims to the administrator inbox.
When was CVE-2026-93873 disclosed?
CVE-2026-93873 was first published in the National Vulnerability Database on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-93873?
CVE-2026-93873 has a CVSS v3 base score of 4.3 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-93873?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-93873, 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

Explore the affected products and dependency analysis for CVE-2026-93873

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