# CVE-2026-120627: CVE-2026-120627

Status: published. Published: 2026-11-02. Updated: 2026-11-10.

The Private Internet Access Extension for Firefox contains an unguarded onAuthRequired authentication handler, leading to leakage of PIA proxy credentials when a user visits any malicious website that issues a Basic auth challenge. This issue was fixed in version 3.2.5, but reintroduced in later versions.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Private Internet Access / Firefox extension: ≥ 3.2.5; ≤ 4.0.5 (affected, custom). Source: CNA: certcc

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N; source: ADP: CISA-ADP

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N; source: NVD: 134c704f-9b21-4f2e-91b3-4a467353bcc0

- CISA KEV: No listing in collected sources

- EPSS: 0.29% as of 2026-11-10; percentile 22.28%

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

- Weaknesses: CWE-287

## Exploit evidence

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

## References

- https://addons.mozilla.org/en-US/firefox/addon/private-internet-access-ext/ (CNA: certcc)

- https://github.com/Rexyysilent/PI-ay-ay-disclosure (CNA: certcc)

- https://addons.mozilla.org/en-US/firefox/addon/private-internet-access-ext/ (cret@cert.org)

- https://github.com/Rexyysilent/PI-ay-ay-disclosure (cret@cert.org)

## Provenance

- CNA: certcc: https://www.cve.org/CVERecord?id=CVE-2026-120627; retrieved 2026-11-10; source updated 2026-11-10

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-120627; retrieved 2026-11-07; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-120627; retrieved 2026-11-10; source updated Not reported

Revision: 875b001a12e0b3c616dd77e9df6cb4443e97c2fcaa9ccea82f448107f991992a

Canonical: https://y2.dev/cve/CVE-2026-120627

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- 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.