How severe is CVE-2021-26123?

CVE-2021-26123 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-26123 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26123?

CVE-2021-26123 affects Livinglogic Xist4c. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-26123?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-26123 published?

CVE-2021-26123 was published on 2021-05-07 and last updated on 2026-06-17.

CVE-2021-26123

CVE-2021-26123 is a medium-severity vulnerability in Livinglogic Xist4c with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Livinglogic Xist4c
Published: 2021-05-07
Last modified: 2026-06-17

Description

LivingLogic XIST4C before 0.107.8 allows XSS via login.htm, login.wihtm, or login-form.htm.

Frequently asked questions

What is CVE-2021-26123?: LivingLogic XIST4C before 0.107.8 allows XSS via login.htm, login.wihtm, or login-form.htm.
How severe is CVE-2021-26123?: CVE-2021-26123 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-26123 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-26123?: CVE-2021-26123 affects Livinglogic Xist4c. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-26123?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-26123 published?: CVE-2021-26123 was published on 2021-05-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:livinglogic:xist4c:*:*:*:*:*:*:*:*

More vulnerabilities in Livinglogic Xist4c

CVE-2021-26122 — Medium (CVSS 6.1): LivingLogic XIST4C before 0.107.8 allows XSS via feedback.htm or feedback.wihtm.

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