Chyrp Lite has an IDOR via Mass Assignment in Post Model
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-639.
Summary
Chyrp Lite is an ultra-lightweight blogging engine. Prior to 2026.01, an IDOR / Mass Assignment issue exists in the Post model that allows authenticated users with post editing permissions (Edit Post, Edit Draft, Edit Own Post, Edit Own Draft) to modify posts they do not own and do not have permission to edit. By passing internal class properties such as id into the post_attributes payload, an attacker can alter the object being instantiated. As a result, further actions are performed on another user’s post rather than the attacker’s own post, effectively enabling post takeover. This vulnerability is fixed in 2026.01.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- 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 |
|---|---|---|---|---|---|
| xenocrat | chyrp-lite | before 2026.01 | 2026.01 | Patch available | CNA |
- chyrp-lite Vendorxenocrat Affected before 2026.01 Fixed in 2026.01 Patch available CNA
Remediation
- Fix · CNA chyrp-lite (xenocrat) Fixed in 2026.01
Timeline
- 2026-10-02 Threatist record created from CVE-2026-35173
References
More Chyrplite Chyrp Lite vulnerabilities
- TI-2026-27328 Chyrp Lite has a Path Traversal to Remote Code Execution CVSS 3.1CRITICAL 9.1
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences