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CVE-2023-26920

19
FAUCET Score

CVE-2023-26920 is a Prototype Pollution vulnerability affecting fast-xml-parser versions prior to 4.1.2, allowing an attacker to manipulate object prototypes via the "__proto__" property. With a CVSS score of 6.5 (Medium), this vulnerability can lead to high confidentiality impact with low attack complexity, requiring low privileges and no user interaction. There is currently no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.1.2CPE matchmatch criteria
cpe:2.3:a:naturalintelligence:fast_xml_parser:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.15%
Probability of exploitation in next 30 days
EPSS Percentile
63.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0115 is in the 78th percentile among its peer group of 21,974 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

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

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: fast-xml-parserFixed in: 4.1.2

Vendor Advisories (1)

npmGHSA-x3cc-x39p-42qxmedium

fast-xml-parser vulnerable to Prototype Pollution through tag or attribute name

Jun 13, 2023

References

gist.github.com / Sudistark/a5a45bd0804d522a1392cb5023aa7ef7
Exploit
github.com / advisories/GHSA-793h-6f7r-6qvm
Third Party Advisory
github.com / NaturalIntelligence/fast-xml-parser/commit/2b032a4f799c63d83991e4f992f1c68e4dd05804
Patch