How severe is CVE-2023-26131?

CVE-2023-26131 has a CVSS 3.x base score of 5.4, 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-2023-26131 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-2023-26131?

CVE-2023-26131 affects Algernon Project Algernon. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-26131?

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

When was CVE-2023-26131 published?

CVE-2023-26131 was published on 2023-05-31 and last updated on 2026-06-17.

CVE-2023-26131

CVE-2023-26131 is a medium-severity vulnerability in Algernon Project Algernon with a CVSS 3.x base score of 5.4. 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 5.4)
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Algernon Project Algernon
Published: 2023-05-31
Last modified: 2026-06-17

Description

All versions of the package github.com/xyproto/algernon/engine; all versions of the package github.com/xyproto/algernon/themes are vulnerable to Cross-site Scripting (XSS) via the themes.NoPage(filename, theme) function due to improper user input sanitization. Exploiting this vulnerability is possible when a file/resource is not found.

Frequently asked questions

What is CVE-2023-26131?: All versions of the package github.com/xyproto/algernon/engine; all versions of the package github.com/xyproto/algernon/themes are vulnerable to Cross-site Scripting (XSS) via the themes.NoPage(filename, theme) function due to improper user input sanitization. Exploiting this vulnerability is possible when a file/resource is not found.
How severe is CVE-2023-26131?: CVE-2023-26131 has a CVSS 3.x base score of 5.4, 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-2023-26131 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-2023-26131?: CVE-2023-26131 affects Algernon Project Algernon. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-26131?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-26131 published?: CVE-2023-26131 was published on 2023-05-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:algernon_project:algernon:*:*:*:*:*:*:*:*

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