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CVE-2021-26272

23
FAUCET Score

CVE-2021-26272 describes a Regular Expression Denial of Service (ReDoS) vulnerability in CKEditor 4 prior to version 4.16, specifically within its Autolink plugin, which also affects Oracle products utilizing this component. An attacker could trigger this by convincing a user to paste specially crafted URL-like text into the editor and then press Enter or Space. This vulnerability has a CVSS score of 6.5 (Medium), indicating a network-based attack requiring user interaction with high availability impact, but no confidentiality or integrity impact. 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
>= 4.0, < 4.16CPE matchmatch criteria
cpe:2.3:a:ckeditor:ckeditor:*:*:*:*:*:*:*:*
9.3.5CPE matchmatch criteria
cpe:2.3:a:oracle:agile_plm:9.3.5:*:*:*:*:*:*:*
9.3.6CPE matchmatch criteria
cpe:2.3:a:oracle:agile_plm:9.3.6:*:*:*:*:*:*:*
< 21.1.0CPE matchmatch criteria
cpe:2.3:a:oracle:application_express:*:*:*:*:*:*:*:*
2.7.0CPE matchmatch criteria
cpe:2.3:a:oracle:banking_party_management:2.7.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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

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

Exploit Intelligence

EPSS Score
2.22%
Probability of exploitation in next 30 days
EPSS Percentile
80.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0222 is in the 91st 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 (2)

npmpatch availablevia ghsa
Product: ckeditor4Fixed in: 4.16.0
oraclepatch availablevia nvd_reference
View patch

Vendor Advisories (1)

npmGHSA-wpvm-wqr4-p7cwmedium

Inclusion of Functionality from Untrusted Control Sphere in CKEditor 4

Oct 13, 2021

References

ckeditor.com / blog/CKEditor-4.16-with-improved-image-pasting-High-Contrast-support-and-a-new-color-API
Vendor Advisory
github.com / ckeditor/ckeditor4/blob/major/CHANGES.md
Release NotesThird Party Advisory
oracle.com / security-alerts/cpujan2022.html
Not ApplicableThird Party Advisory
oracle.com / /security-alerts/cpujul2021.html
PatchThird Party Advisory
oracle.com / security-alerts/cpuoct2021.html
PatchThird Party Advisory