What is CVE-2022-0558?

CVE-2022-0558 is a medium-severity vulnerability in Microweber, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2022-02-10.

How severe is CVE-2022-0558?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Is CVE-2022-0558 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Microweber

CVE-2022-0558

Cross-site Scripting (XSS) - Stored in Packagist microweber/microweber prior to 1.2.11.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-02-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.009 (58.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Microweber
Microweber Microweber/microweber — versions unspecified

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

huntr.dev/bounties/8fffc95f-14ae-457b-aecc-be4716a8b91c (Exploit, Third Party Advisory)
github.com/microweber/microweber/commit/14a1bb971bcb8b5456c2bf0020c3018907a2704d (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2022-0558?: CVE-2022-0558 is a medium-severity vulnerability in Microweber, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2022-02-10.
How severe is CVE-2022-0558?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2022-0558 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.