# CVE-2026-77026: Joomla Extension - tassos.gr - Client-controlled validation bypass in Convert Forms extension 1.0.0-4.4.16, 5.0.0-5.2.5

Status: published. Published: 2026-08-20. Updated: 2026-11-02.

Joomla Extension - tassos.gr - Client-controlled validation bypass in Convert Forms extension 1.0.0-4.4.16, 5.0.0-5.2.5 - CAPTCHA and field validation bypass.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- tassos.gr / Convert Forms extension for Joomla: 1.0.0-4.4.16 (affected); 5.0.0-5.2.5 (affected). Source: CNA: Joomla

## Severity and prioritization

- CVSS 4.0: 6.9 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N; source: CNA: Joomla

- CISA KEV: No listing in collected sources

- EPSS: 0.45% as of 2026-11-01; percentile 39.43%

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-602

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://www.tassos.gr/joomla-extensions/convert-forms (CNA: Joomla; product)

## Provenance

- CNA: Joomla: https://www.cve.org/CVERecord?id=CVE-2026-77026; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-77026; retrieved 2026-11-02; source updated Not reported

Revision: 15831a6c8bc88f36981d2aa8b02734f809eb17a40b77674e079eef3f8ef6c731

Canonical: https://y2.dev/cve/CVE-2026-77026

## Agent and API access

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- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.