CVE-2023-2266: An Improper neutralization of input during web page generation in the Schweitzer Engineering Laboratories SEL-

Q: How do I fix CVE-2023-2266?

sel-411l firmware: upgrade to r118-v4, r119-v5, r120-v6, r121-v3, r122-v3, r123-v3, r124-v3, r125-v3, r126-v4, r127-v2. Exact commands for each OS are on this page.

Q: Is CVE-2023-2266 being exploited?

CVE-2023-2266 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-2266 affect?

CVE-2023-2266 affects sel-411l firmware. Severity is medium (CVSS 4.3). An Improper neutralization of input during web page generation in the Schweitzer Engineering Laboratories SEL-411L could allow an attacker to generate cross-site scripting based attacks against an authorized and authenticated user. See p

Q: How urgent is CVE-2023-2266?

Priority 24/100. No elevated risk signals yet.

Routine

MEDIUM 4.3UPGRADE

CVE-2023-2266 is a medium-severity flaw (CVSS 4.3) affecting sel-411l firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An Improper neutralization of input during web page generation in the Schweitzer Engineering Laboratories SEL-411L could allow an attacker to generate cross-site scripting based attacks against an authorized and authenticated user. See product Instruction Manual Appendix A dated 20230830 for more details.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 65%)
CISA exploited list	No
Weakness	CWE-79
Published	2023-11-30
Last modified	2026-06-17

Publisher (CNA): Schweitzer Engineering Laboratories, Inc. · Vendor: selinc

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-11-30 17:15 UTCPublished CVE record published
2026-06-17 05:52 UTCUpdated Record last modified

selinc sel-411l firmware UPGRADE

Affected: >= r118-v0 and < r118-v4 · >= r119-v0 and < r119-v5 · >= r120-v0 and < r120-v6 · >= r121-v0 and < r121-v3 · >= r122-v0 and < r122-v3 · >= r123-v0 and < r123-v3 · >= r124-v0 and < r124-v3 · >= r125-v0 and < r125-v3

Fixed in: r118-v4, r119-v5, r120-v6, r121-v3, r122-v3, r123-v3, r124-v3, r125-v3, r126-v4, r127-v2

Safe to downgrade to: a release before r118-v0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-2266?

sel-411l firmware: upgrade to r118-v4, r119-v5, r120-v6, r121-v3, r122-v3, r123-v3, r124-v3, r125-v3, r126-v4, r127-v2. Exact commands for each OS are on this page.

Is CVE-2023-2266 being exploited?

CVE-2023-2266 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-2266 affect?

CVE-2023-2266 affects sel-411l firmware. Severity is medium (CVSS 4.3). An Improper neutralization of input during web page generation in the Schweitzer Engineering Laboratories SEL-411L could allow an attacker to generate cross-site scripting based attacks against an authorized and authenticated user. See p

How urgent is CVE-2023-2266?

Priority 24/100. No elevated risk signals yet.

Related CVEs

CVE-2023-2267 MEDIUM 4.3 UPGRADE An Improper Input Validation vulnerability in Schweitzer Engineering Laboratories SEL-411L could allow an atta
CVE-2023-2265 MEDIUM 4.3 UPGRADE An Improper Restriction of Rendered UI Layers or Frames in the Schweitzer Engineering Laboratories SEL-411L co
CVE-2023-2264 MEDIUM 4.0 UPGRADE An improper input validation vulnerability in the Schweitzer Engineering Laboratories SEL-411L could allow a m

References

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