PatchTheCVECVE-2023-26133: All versions of the package progressbar.js are vulnerable to Prototype Pollution via the function extend() in
CVE-2023-26133 is a high-severity flaw (CVSS 8.2) affecting progressbar.js. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
All versions of the package progressbar.js are vulnerable to Prototype Pollution via the function extend() in the file utils.js.
Why this priority
- High severity
- Public exploit reference
- Remotely exploitable, no login, no user action
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 8.2 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.3% (top 30%) |
| CISA exploited list | No |
| Weakness | CWE-1321 |
| Published | 2023-06-12 |
| 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-2023-26133?
progressbar.js: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2023-26133 being exploited?
CVE-2023-26133 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-2023-26133 affect?
CVE-2023-26133 affects progressbar.js. Severity is high (CVSS 8.2). All versions of the package progressbar.js are vulnerable to Prototype Pollution via the function extend() in the file utils.js.
How urgent is CVE-2023-26133?
Priority 56/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action