🛡️ CVE-2026-33875 — authenticator

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality high, integrity high, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

• Attack vector: Network — reachable from anywhere that can route to the service.
• Attack complexity: Low — the attack works reliably, with no preparation.
• Privileges required: None — an unauthenticated stranger can try it.
• User interaction: Required — someone has to click, open or visit something.
• Scope: Changed — a successful attack reaches components beyond the vulnerable one.
• Confidentiality impact: High — total loss, or loss the attacker controls.
• Integrity impact: High — total loss, or loss the attacker controls.
• Availability impact: None.

Weakness class

CVE-2026-33875 is classified as CWE-940: Improper Verification of Source of a Communication Channel. The product establishes a communication channel to handle an incoming request that has been initiated by an actor, but it does not properly verify that the request is coming from the expected origin.

Affected software

CVE-2026-33875 is recorded against 1 package.

• authenticator (fixed in 4.16.0)

Timeline and source

Published on 27 March 2026 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com
www.machinespirits.com

Other advisories for this package

authenticator has other advisories on record. If you are patching this one, these are worth checking on the same host:

• CVE-2026-41615 (9.6 Critical, published 14 May 2026)
• CVE-2026-33874 (7.8 High, published 27 Mar 2026)
• CVE-2026-26123 (5.5 Medium, published 10 Mar 2026)
• CVE-2025-54154 (6.8 Medium, published 3 Oct 2025)
• CVE-2024-45394 (8.8 High, published 3 Sep 2024)
• CVE-2024-21390 (7.1 High, published 12 Mar 2024)
• CVE-2023-27895 (6.1 Medium, published 14 Mar 2023)
• CVE-2022-3994 (4.3 Medium, published 2 Jan 2023)

Same weakness in other software

These advisories are the same class of weakness (CWE-940: Improper Verification of Source of a Communication Channel) in other software:

• CVE-2026-54106 (4.7 Medium, published 18 Jun 2026)
• CVE-2026-48745 (9.3 Critical, published 17 Jun 2026)
• CVE-2026-44894 (8.0 High, published 12 Jun 2026)
• CVE-2026-43880 (5.3 Medium, published 11 May 2026)
• CVE-2026-23866 (4.3 Medium, published 1 May 2026)
• CVE-2026-40434 (8.1 High, published 17 Apr 2026)
• CVE-2026-2967 (3.7 Low, published 23 Feb 2026)
• CVE-2026-22269 (4.7 Medium, published 19 Feb 2026)

Details

Affected Packages

References