CVE-2026-73243 kkFileView: Unauthenticated SSRF via /addTask with fullfilename type-confusion bypass
Unauthenticated attackers can trigger Server-Side Request Forgery via the /addTask endpoint by manipulating file type parameters, potentially accessing internal resources.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-73243?
CVE-2026-73243 is a medium-severity server-side request forgery vulnerability in kekingcn kkFileView, published on 11 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
kkFileView is a universal file online preview project based on Spring Boot. Prior to 5.0.1, the unauthenticated GET /addTask endpoint in kkFileView is omitted from TrustHostFilter and TrustDirFilter in server/src/main/java/cn/keking/config/WebConfig.java, allowing FileConvertQueueTask to fetch an attacker-selected URL after FileHandlerService#getFileAttribute uses the fullfilename parameter to force an OFFICE, COMPRESS, or CAD type. This issue is fixed in version 5.0.1.
Weakness: CWE-918
Which versions are affected by CVE-2026-73243?
How do I fix CVE-2026-73243?
No fix has been published for CVE-2026-73243 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-73243 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-73243 exists.
Sources
Also known as GHSA-gwwj-52hv-6g2m.