# CVE-2026-111675: Course-tencent-cloud through 2.0.1 Verification Code Brute Force Account Takeover

> Unauthenticated attackers can brute force 6-digit verification codes to take over user accounts due to missing rate limits and code invalidation.

- **Severity:** Critical 9.1 (`CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Oct 2026
- **Updated:** 19 Oct 2026
- **Also known as:** GHSA-h2mg-h5vq-xqx3

## What is CVE-2026-111675?

CVE-2026-111675 is a critical authentication bypass vulnerability in xiaochong0302 course-tencent-cloud, published on 16 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Course-tencent-cloud through 2.0.1 contains an improper restriction of authentication attempts vulnerability that allows unauthenticated attackers to brute force 6-digit SMS/email verification codes, which are never invalidated or attempt-limited. Attackers who know a victim's phone or email can trigger a code and rotate source IPs against the password reset and verify login endpoints to take over accounts.

Weakness: CWE-307 (Improper Restriction of Excessive Authentication Attempts)

## Which versions are affected by CVE-2026-111675?


## How do I fix CVE-2026-111675?

No fix has been published for CVE-2026-111675 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-111675 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-111675 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-111675 and fix it if it is affected.

What it is: CVE-2026-111675 is a critical authentication bypass vulnerability in xiaochong0302 course-tencent-cloud, published on 16 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-111675 exists.

Affected product: xiaochong0302 course-tencent-cloud. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-111675/ (Markdown: https://insights.sbomify.com/CVE-2026-111675/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-111675
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-111675
- OSV: https://osv.dev/vulnerability/CVE-2026-111675

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-111675/
Summaries are generated and may contain mistakes; the official description above is the record.