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CVE-2021-46872

21
FAUCET Score

CVE-2021-46872 describes a Cross-Site Scripting (XSS) vulnerability in the RST module of the Nim language standard library, affecting Nim versions prior to 1.6.2 and NimForum. This medium-severity vulnerability (CVSS 6.1) allows attackers to inject malicious scripts via the javascript: URI scheme, requiring user interaction and potentially leading to information disclosure or data manipulation. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.6.2CPE matchmatch criteria
cpe:2.3:a:nim-lang:nim:*:*:*:*:*:*:*:*
< 2.2.0CPE matchmatch criteria
cpe:2.3:a:nim-lang:nimforum:*:*:*:*:*:nim:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.54%
Probability of exploitation in next 30 days
EPSS Percentile
42.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0054 is in the 45th percentile among its peer group of 26,236 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

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

forum.nim-lang.org / t/8852
Issue TrackingVendor Advisory
github.com / nim-lang/Nim/commit/46275126b89218e64844eee169e8ced05dd0e2d7
PatchThird Party Advisory
github.com / nim-lang/Nim/compare/v1.6.0...v1.6.2
Third Party Advisory
github.com / nim-lang/nimforum
Third Party Advisory
github.com / nim-lang/Nim/pull/19134
PatchThird Party Advisory