CVE-2023-26131 — All versions of the package github

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 vul

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
n	a / github.com/xyproto/algernon/engine	0
n	a / github.com/xyproto/algernon/themes	0

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-05-31T05:00:01.493Z
• Last modified: 2025-01-09T20:38:45.687Z

09References

• security.snyk.io — https://security.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMXYPROTOALGERNONENGINE-3312111
• security.snyk.io — https://security.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMXYPROTOALGERNONTHEMES-3312112
• github.com — https://github.com/xyproto/algernon/blob/aab484608651852d02a8a93f40baf53ed93e639…
• github.com — https://github.com/xyproto/algernon/blob/aab484608651852d02a8a93f40baf53ed93e639…
• github.com — https://github.com/xyproto/algernon/blob/aab484608651852d02a8a93f40baf53ed93e639…