Auth bypass in Documenso
CVE-2026-13543
A vulnerability was detected in Documenso up to 2.11.0. Affected by this vulnerability is an unknown functionality of the file packages/auth/server/lib/utils/handle-oauth-callback-url.ts of the component Google OAuth Login. The manipulation results in improper authentication. It is possible to launch the attack remotely. This attack is characterized by high complexity. The exploitation appears to be difficult. The exploit is now public and may be used. The pull request to fix this issue awaits acceptance.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.006 (46.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Documenso — versions 2.0, 2.1, 2.2
Weakness classification (CWE)
References
- vuldb.com/vuln/374551 (vdb-entry)
- vuldb.com/vuln/374551/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-13543 (third-party-advisory)
- vuldb.com/submit/842579 (third-party-advisory)
- github.com/documenso/documenso/issues/2758 (issue-tracking, exploit)
- github.com/documenso/documenso/pull/2837 (issue-tracking, patch)
- github.com/documenso/documenso/ (product)
Frequently asked questions
- What is CVE-2026-13543?
- CVE-2026-13543 is a medium-severity vulnerability in Documenso, classified under Improper Authentication. CVSS score: 5.6/10. Published 2026-06-29.
- How severe is CVE-2026-13543?
- Medium severity. CVSS v3 base score is 5.6 out of 10.