Quick answers
- Is CVE-2026-67993 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-67993 being exploited in the wild.
- How severe is CVE-2026-67993?
- Informational severity, published 29 September 2026.
- Which products and versions are affected?
- Basecamp Upright at commit efe4f2e5254ac6e57e45d2261804cca74dbbca3f and earlier.
- Is there a fix for CVE-2026-67993?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-67993 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-67993?
- Check whether you run Basecamp Upright 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.
Technical details
The SessionsController in Upright skips CSRF protection on the create action (line: skip_forgery_protection only: :create) while processing OmniAuth authentication. An attacker can craft a cross-site request that induces a victim to visit a malicious page, causing the victim's browser to submit a login request to the Upright instance under the attacker's controlled OmniAuth session. This allows account takeover if the victim is already authenticated with the OmniAuth provider.
Affected products
- Basecamp Upright at commit efe4f2e5254ac6e57e45d2261804cca74dbbca3f and earlier
Timeline
- 2026-09-29: disclosed