Broken access control in MrDoc lets users alter other users' shares
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-639.
Summary
MrDoc through 1.1.1 contains a broken access control flaw in the manage_doc_share function because share updates lack an ownership check (CWE-639). An authenticated user with low privileges can modify other users' document share settings, re-enable disabled shares or remove access codes, which exposes private documents. The share tokens are predictable, so they can be derived without access to the shares themselves.
Written with Claude Haiku 5.5 from the sources below · 2026-11-02
Description from the CNA
MrDoc through 1.1.1 contains a broken access control vulnerability in the manage_doc_share type 3 branch that allows authenticated users to modify other users' document share settings because updates lack an ownership check. Attackers can compute predictable share tokens from the MD5 of document ID and username to re-enable disabled shares or remove access codes, exposing private documents.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| zmister2016 | MrDoc | up to 1.1.1 | — | No fix listed | CNA |
- MrDoc Vendorzmister2016 Affected up to 1.1.1 Fixed in — No fix listed CNA
Remediation
The sources list no fixed version for MrDoc.
Written with Claude Haiku 5.5 from the sources below · 2026-11-02
Timeline
- 2026-10-27 Threatist record created from CVE-2026-117563
- 2026-10-27 Alias added: GHSA-rf24-chhw-3jch
- 2026-11-02 CISA SSVC decision points changed
References
More zmister2016 vulnerabilities
- TI-2026-83819 Missing authorization in MrDoc get_doctemp exposes other users' templates CVSS 4.0MEDIUM 5.3
- TI-2026-75431 Missing authorization in MrDoc allows editing other users' documents CVSS 4.0MEDIUM 5.3
Sources
- CVE-2026-117563 · CVE Program
- CVE-2026-117563 · NVD
- FIRST EPSS
- GHSA-rf24-chhw-3jch · GitHub Advisory Database · CC BY 4.0
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