PatchTheCVECVE-2021-26617: This issues due to insufficient verification of the various input values from user’s input
CVE-2021-26617 is a high-severity flaw (CVSS 8.1) affecting firstmall. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
This issues due to insufficient verification of the various input values from user’s input. The vulnerability allows remote attackers to execute malicious code in Firstmall via navercheckout_add function.
Why this priority
- High severity
- Remotely exploitable, no login, no user action
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 8.1 (High) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.3% (top 30%) |
| CISA exploited list | No |
| Weakness | CWE-20 |
| Published | 2022-02-25 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-26617?
firstmall: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2021-26617 being exploited?
CVE-2021-26617 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-26617 affect?
CVE-2021-26617 affects firstmall. Severity is high (CVSS 8.1). This issues due to insufficient verification of the various input values from user’s input. The vulnerability allows remote attackers to execute malicious code in Firstmall via navercheckout_add function.
How urgent is CVE-2021-26617?
Priority 51/100. High severity; Remotely exploitable, no login, no user action