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VulnerabilityPublished

CVE-2026-41070: jkroepke openvpn-auth-oauth2 · Improper Authentication

Affects jkroepke openvpn-auth-oauth2Source CVE Database V5

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Not known to be exploited · CVSS 10.0 Critical : upgrade to 1.27.3 as a priority.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 3.1 base score
10.0Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.4% chance of exploitation in 30 days – higher than 38% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1.27.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 8 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade openvpn-auth-oauth2 and jkroepke/openvpn-auth-oauth2 to 1.27.3.

Affected software

ProductAffectedFixed in
jkroepkeopenvpn-auth-oauth2Affected
  • >=1.26.3 <1.27.3
Fixed in
  • 1.27.3
GitHubjkroepke/openvpn-auth-oauth2pkg:github/jkroepke/openvpn-auth-oauth2Other threatsAffected
  • <1.27.3 >=1.26.3
Fixed in
  • 1.27.3

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade openvpn-auth-oauth2 to version 1.27.3 or later, where this authentication bypass vulnerability is fixed. If upgrading immediately is not possible, avoid using the experimental plugin mode that triggers this issue. The default management-interface mode is not affected by this vulnerability. Patch status is not explicitly stated but the vendor fixed the issue in version 1.27.3, so applying this official fix is the recommended remediation.

Description

openvpn-auth-oauth2 is a plugin/management interface client for OpenVPN server to handle an OIDC based single sign-on (SSO) auth flows. From version 1.26.3 to before version 1.27.3, when openvpn-auth-oauth2 is deployed in the experimental plugin mode (shared library loaded by OpenVPN via the plugin directive), clients that do not support WebAuth/SSO (e.g., the openvpn CLI on Linux) are incorrectly admitted to the VPN despite being denied by the authentication logic. The default management-interface mode is not affected because it does not use the OpenVPN plugin return-code mechanism. This issue has been patched in version 1.27.3.

References

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