Documenso Google OAuth Login handle-oauth-callback-url.ts improper authentication (CVE-2026-13543) | HOL Guard CVE

Medium · CVSS 5.6CVE-2026-13543

Documenso Google OAuth Login handle-oauth-callback-url.ts improper authentication

Answer in brief

CVE-2026-13543 records a Medium severity (CVSS 5.6) vulnerability in Documenso Google OAuth Login handle-oauth-callback-url.ts improper authentication. The current sources do not mark it as known exploited. The current feed maps n/a/Documenso (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 29, 2026Updated Jun 29, 2026Source checked Sep 19, 2026First seen by HOL Jun 29, 2026Material review Jun 29, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.6
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 5.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps n/a/Documenso (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
n/a/Documensogeneric	2.0 \|\| 2.1 \|\| 2.2 \|\| 2.3 \|\| 2.4 \|\| 2.5 \|\| 2.6 \|\| 2.7 \|\| 2.8 \|\| 2.9 \|\| 2.10 \|\| 2.11.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for n/a/Documenso.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Jun 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Jun 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jun 29, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.