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

Severity: high (CVSS 7.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-16 · updated 2026-10-19
Weakness: CWE-307

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.

Affected products

xiaochong0302 course-tencent-cloud: through 2.0.1

References

https://github.com/xiaochong0302/course-tencent-cloud/blob/v2.0.1/app/Services/Logic/Account/PasswordReset.php
https://github.com/xiaochong0302/course-tencent-cloud/blob/v2.0.1/app/Services/Verify.php#L27-L73
https://hackmd.io/@hieuPenguinnn/ctc-verify-code-brute-force-account-takeover
https://www.vulncheck.com/advisories/course-tencent-cloud-through-2.0.1-verification-code-brute-force-account-takeover
https://hackmd.io/@hieuPenguinnn/ctc-verify-code-brute-force-account-takeover

Get alerted when CVE-2026-111675 or the next vulnerability affects your stack