Mintlify Platform: Improper Neutralization of Special Elements Used in a Template Engine
CVE-2025-67843 is a critical-severity improper neutralization of special elements used in a template engine vulnerability in Mintlify Platform from Mintlify, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version 2025-11-15 as the first without the flaw, so updating Mintlify Platform to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 1.11% chance of exploitation within 30 days, higher than 66% of scored CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Update Mintlify Platform to 2025-11-15 or a later version.
- Update Mintlify to 2025-11-15 or a later version.
- Read the advisory on mintlify.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Mintlify | Mintlify Platform | before 2025-11-15 | 2025-11-15 |
| Mintlify | Mintlify | before 2025-11-15 | 2025-11-15 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 8.3 | High | CNA (mitre.org) |
| CVSS 3.1 | 9.8 | Critical | NVD |
Official description
A Server-Side Template Injection (SSTI) vulnerability in the MDX Rendering Engine in Mintlify Platform before 2025-11-15 allows remote attackers to execute arbitrary code via inline JSX expressions in an MDX file.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Neutralization of Special Elements Used in a Template Engine
The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine.
How developers prevent this class of flaw
- Choose a template engine that offers a sandbox or restricted mode, or at least limits the power of any available expressions, function calls, or commands.
- Use the template engine's sandbox or restricted mode, if available.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: poc, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- mintlify.com/docs/changelogRelease Notes
Technical write-ups (may include proof of concept)
- kibty.town/blog/mintlify/Exploit, Third Party Advisory
Other references
- news.ycombinator.com/item?id=46317098Issue Tracking
Recent Improper Neutralization of Special Elements Used in a Template Engine vulnerabilities
- 9.9 Critical severity
- 8.6 High severity
- 8.6 High severity
- 7.5 High severity
- 8.8 High severity
- 8.3 High severity
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