CVE-2021-3906
Unrestricted Upload of File with Dangerous Type in bookstackapp/bookstack
MEDIUM
6.5
CVSS Score
Published: October 27, 2021 at 09:20 PM UTC
Updated: June 17, 2026 at 04:05 AM UTC
1 product affected across 1 vendorBookStack
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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.7%
Description
bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 21.10.1
Affected range stops below 21.10.1, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (2)
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/bookstackapp/bookstack/commit/64937ab826b56d086af9ecea532510d37520ebc8x_refsource_CONFIRMExploitIssue TrackingPatchThird Party Advisory
Source: [email protected]
https://huntr.dev/bounties/f115bdf5-c06b-4627-a6fa-ba6904a43ba3CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- NONE
- Availability
- NONE
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-434
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