CVE-2021-46872

Name: CVE-2021-46872
Creator: NVD / NIST
Published: 2023-01-13T06:15:10.94+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.54%

Last modified Jun 17, 2026

CVE-2021-46872 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. An issue was discovered in Nim before 1.6.2. The RST module of the Nim language stdlib, as used in NimForum and other products, permits the javascript: URI scheme and thus can lead to XSS in some applications. EPSS estimates a 0.54% chance of exploitation in the next 30 days.

Description

An issue was discovered in Nim before 1.6.2. The RST module of the Nim language stdlib, as used in NimForum and other products, permits the javascript: URI scheme and thus can lead to XSS in some applications. (Nim versions 1.6.2 and later are fixed; there may be backports of the fix to some earlier versions. NimForum 2.2.0 is fixed.)

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

0.54%

41.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nim-Lang	Nim	< 1.6.2
Nim-Lang	Nimforum	< 2.2.0

References

https://forum.nim-lang.org/t/8852Issue Tracking, Vendor Advisory
https://github.com/nim-lang/Nim/commit/46275126b89218e64844eee169e8ced05dd0e2d7Patch, Third Party Advisory
https://github.com/nim-lang/Nim/compare/v1.6.0...v1.6.2Third Party Advisory
https://github.com/nim-lang/Nim/pull/19134Patch, Third Party Advisory
https://github.com/nim-lang/nimforumThird Party Advisory
https://forum.nim-lang.org/t/8852Issue Tracking, Vendor Advisory
https://github.com/nim-lang/Nim/commit/46275126b89218e64844eee169e8ced05dd0e2d7Patch, Third Party Advisory
https://github.com/nim-lang/Nim/compare/v1.6.0...v1.6.2Third Party Advisory
https://github.com/nim-lang/Nim/pull/19134Patch, Third Party Advisory
https://github.com/nim-lang/nimforumThird Party Advisory

Timeline

Published: Jan 13, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-46872?

How severe is CVE-2021-46872?

CVE-2021-46872 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.54% probability of exploitation in the next 30 days.

How do I fix CVE-2021-46872?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-46872?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST