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CVE-2023-26131

20
FAUCET Score

CVE-2023-26131 describes a Cross-site Scripting (XSS) vulnerability affecting all versions of the github.com/xyproto/algernon/engine and github.com/xyproto/algernon/themes packages. This flaw stems from insufficient sanitization of user input within the themes.NoPage() function, allowing an attacker to inject malicious scripts when a requested file or resource is not found. Rated 6.1 MEDIUM, the vulnerability requires user interaction (UI:R) but can be exploited remotely (AV:N) with low attack complexity (AC:L), potentially leading to limited confidentiality and integrity impacts (C:L/I:L). Currently, there is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:a:algernon_project:algernon:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.4MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.5
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.69%
Probability of exploitation in next 30 days
EPSS Percentile
49.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0069 is in the 54th percentile among its peer group of 26,234 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

goGHSA-g47h-fgcw-g4phmedium

Algernon engine and themes vulnerable to Cross-site Scripting

May 31, 2023

References

github.com / xyproto/algernon/blob/aab484608651852d02a8a93f40baf53ed93e639a/engine/handlers.go%23L512
Broken Link
github.com / xyproto/algernon/blob/aab484608651852d02a8a93f40baf53ed93e639a/engine/handlers.go%23L514
Broken Link
github.com / xyproto/algernon/blob/aab484608651852d02a8a93f40baf53ed93e639a/themes/html.go%23L145
Broken Link
security.snyk.io / vuln/SNYK-GOLANG-GITHUBCOMXYPROTOALGERNONENGINE-3312111
ExploitThird Party Advisory
security.snyk.io / vuln/SNYK-GOLANG-GITHUBCOMXYPROTOALGERNONTHEMES-3312112
ExploitThird Party Advisory