Credential leak in Private Internet Access Firefox extension
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-287.
Summary
The Private Internet Access Firefox extension from 3.2.5 through 4.0.5 contains an unguarded onAuthRequired authentication handler that leaks PIA proxy credentials (CWE-287). An unauthenticated remote attacker needs only a user who visits a malicious website that issues a Basic auth challenge. The source says this issue was fixed in version 3.2.5 but reintroduced in later versions.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Description from the CNA
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Private Internet Access | Firefox extension | 3.2.5 – 4.0.5 | — | No fix listed | CNA |
- Firefox extension VendorPrivate Internet Access Affected 3.2.5 – 4.0.5 Fixed in — No fix listed CNA
Remediation
The sources list no fixed version for Private Internet Access Firefox extension.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Timeline
- 2026-11-02 Threatist record created from CVE-2026-120627
- 2026-11-02 Alias added: GHSA-x5vg-vpvp-9jx9
- 2026-11-06 CVSS score added · CISA ADP
- 2026-11-06 Weakness changed · CISA ADP
- 2026-11-06 CISA SSVC decision points changed
References
More Private Internet Access vulnerabilities
- TI-2022-26377 Private Internet Access 3.3 - 'pia-service' Unquoted Service Path CVSS 4.0HIGH 8.5
- TI-2020-12265 A vulnerability in the Private Internet Access (PIA) VPN Client for Linux 1.5 through… CVSS 3.1HIGH 7.5
Sources
- CVE-2026-120627 · CVE Program
- CVE-2026-120627 · NVD
- FIRST EPSS
- GHSA-x5vg-vpvp-9jx9 · GitHub Advisory Database · CC BY 4.0
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