# CVE-2026-115910: Python Social Auth OpenID Connect nonce reuse

Source: https://junglewise.ai/threats/cve-2026-115910-python-social-auth-is-a-social-authentication-and-registration  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-26. Updated: 2026-10-26  
License: CC BY 4.0 with a link back

CVE-2026-115910 · Severity: medium · CVSS 6.8 · Published 2026-10-26

Python Social Auth is a library that enables users to log in to web applications using OpenID Connect providers. An attacker who intercepts a victim's authorization code can use it to log in as that victim on a different browser or device by reusing the victim's nonce, which is stored globally rather than tied to a specific login session. This could allow complete account takeover without the victim's knowledge.

Technologies: [social-auth-core (PyPI)](https://junglewise.ai/threats/technologies/social-auth-core). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi), [Python-Social-Auth](https://junglewise.ai/threats/vendors/python-social-auth).

## Quick answers

**Is CVE-2026-115910 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-115910 being exploited in the wild.

**How severe is CVE-2026-115910?** Medium severity, with a CVSS score of 6.8, published 26 October 2026.

**Which products and versions are affected?** social-auth-core (PyPI) <= 6.1.1, ECOSYSTEM:introduced=0,fixed=6.2.0; Python-Social-Auth Social-Auth-Core before 6.2.0.

**Is there a fix for CVE-2026-115910?** Yes. social-auth-core (PyPI): upgrade to 6.2.0 or later. Until then: Enable DEFAULT_USE_PKCE in the OpenIdConnectAuth configuration to add PKCE protection, which binds the authorization code to the code_verifier and prevents code reuse. In-progress OIDC logins must be restarted after upgrading to 6.2.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-115910 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-115910?** Check whether you run social-auth-core (PyPI) or Python-Social-Auth Social-Auth-Core at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- social-auth-core (PyPI): upgrade to 6.2.0 or later

  ```sh
  pip install "social-auth-core>=6.2.0"
  ```


Enable DEFAULT_USE_PKCE in the OpenIdConnectAuth configuration to add PKCE protection, which binds the authorization code to the code_verifier and prevents code reuse. In-progress OIDC logins must be restarted after upgrading to 6.2.0.

## Technical details

The OpenIdConnectAuth backend stores OpenID Connect nonces in a shared OpenIdConnectAssociation table and validates them only for existence and expiration rather than binding them to the initiating browser session and OAuth state. An attacker with access to a victim's authorization code can initiate their own login, obtain valid state for their browser, and submit the victim's code with that state; the nonce validation passes because the victim's nonce is globally available. With DEFAULT_USE_PKCE disabled (the default), the attacker can complete authentication as the victim.

## Affected products

- python-social-auth Social Auth Core before 6.2.0

## Identifiers

- CVE-2026-115910
- GHSA-h2r5-x5m7-3935

## Timeline

- 2026-10-26: disclosed
- 2026-10-20: patched

## References

- [https://github.com/python-social-auth/social-core/commit/c2f2ae4663bef19ee8b07f2cf5a2344f9155d826](https://github.com/python-social-auth/social-core/commit/c2f2ae4663bef19ee8b07f2cf5a2344f9155d826)
- [https://github.com/python-social-auth/social-core/pull/2141](https://github.com/python-social-auth/social-core/pull/2141)

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