CVE-2026-50885: Sismics Docs Auth Bypass Vulnerability

CVE-2026-50885 Overview

CVE-2026-50885 is a broken access control vulnerability in Sismics Docs (Teedy) version 1.11. The flaw resides in the share-based read endpoints, which fail to properly verify authorization before returning data. Unauthorized remote attackers can craft requests to reach sensitive endpoints without valid credentials or share tokens. The weakness is classified under [CWE-284] Improper Access Control and impacts the confidentiality of documents managed by the platform.

Critical Impact
Remote, unauthenticated attackers can read sensitive content exposed by Teedy v1.11 share endpoints by sending crafted HTTP requests.

Affected Products

Sismics Docs (Teedy) v1.11
Share-based read endpoints in the Teedy REST API
Document management deployments running the vulnerable release

Discovery Timeline

2026-06-15 - CVE-2026-50885 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-50885

Vulnerability Analysis

Sismics Docs, also known as Teedy, is an open source document management application. The platform exposes share-based read endpoints that allow recipients of a share link to retrieve specific resources without authenticating as a full user. In version 1.11, these endpoints do not consistently validate that the requested resource belongs to the share context presented by the caller. An attacker who supplies a crafted request can reach endpoints that should require either authenticated session credentials or a valid share token bound to the requested object.

The issue is a server-side authorization gap rather than an authentication failure. The application accepts the request, executes the underlying read operation, and returns data that the caller has no legitimate right to view. Because the attack travels over the network without user interaction and requires no privileges, exploitation is straightforward against any internet-exposed instance.

The EPSS model places exploitation probability in the lower range as of 2026-06-18, but the absence of authentication requirements makes opportunistic scanning likely once details circulate. A proof-of-concept script has been published on GitHub Gist, lowering the barrier to weaponization.

Root Cause

The root cause is missing or incomplete authorization checks on share-scoped read endpoints. The application trusts request parameters to determine accessible resources instead of enforcing server-side ownership and share-membership validation. This pattern aligns with [CWE-284] Improper Access Control.

Attack Vector

The attack vector is the network. An attacker sends a crafted HTTP request directly to vulnerable endpoints on a Teedy v1.11 instance. No authentication, share token, or user interaction is needed. A working request structure is demonstrated in the published GitHub Gist PoC Script.

Detection Methods for CVE-2026-50885

Indicators of Compromise

Unauthenticated HTTP requests to Teedy share API paths returning HTTP 200 with document payloads.
Spikes in access to share-related endpoints from a single source IP enumerating identifiers.
Application logs showing successful read operations without a corresponding authenticated session ID.

Detection Strategies

Inspect Teedy access logs for sequential or randomized requests to share-based read endpoints from unauthenticated clients.
Deploy web application firewall rules that flag requests to share endpoints lacking valid share tokens or session cookies.
Correlate outbound document downloads with the originating share context to identify mismatches.

Monitoring Recommendations

Forward Teedy reverse-proxy and application logs to a centralized analytics platform for retention and search.
Alert on high request rates against the share API surface, especially from non-corporate IP ranges.
Baseline normal share-link usage patterns and trigger investigations on statistical anomalies.

How to Mitigate CVE-2026-50885

Immediate Actions Required

Inventory all Teedy deployments and confirm whether they run version 1.11 or earlier.
Restrict network exposure of Teedy instances to trusted networks or VPN until a patched release is applied.
Review share-link usage and revoke shares that are no longer required.

Patch Information

No fixed version is referenced in the available CVE data. Operators should monitor the Sismics Docs project on GitHub for an upstream release that addresses the share endpoint authorization checks and upgrade as soon as a patched build is available.

Workarounds

Place the Teedy application behind an authenticating reverse proxy that enforces access control before requests reach the share endpoints.
Block direct external access to share API paths at the WAF or load balancer until a vendor fix is released.
Disable share functionality at the application configuration level if it is not required for business operations.

bash

# Example nginx restriction limiting share endpoints to internal networks
location /api/share/ {
    allow 10.0.0.0/8;
    deny all;
    proxy_pass http://teedy_backend;
}