CVE-2021-26558

Name: CVE-2021-26558
Creator: NVD / NIST
Published: 2021-11-11T10:15:07.48+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.41%

Last modified Jun 17, 2026

CVE-2021-26558 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Deserialization of Untrusted Data vulnerability of Apache ShardingSphere-UI allows an attacker to inject outer link resources. This issue affects Apache ShardingSphere-UI Apache ShardingSphere-UI version 4.1.1 and later versions; Apache ShardingSphere-UI versions prior to 5.0.0.. EPSS estimates a 2.41% chance of exploitation in the next 30 days.

Description

Deserialization of Untrusted Data vulnerability of Apache ShardingSphere-UI allows an attacker to inject outer link resources. This issue affects Apache ShardingSphere-UI Apache ShardingSphere-UI version 4.1.1 and later versions; Apache ShardingSphere-UI versions prior to 5.0.0.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

2.41%

82.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Apache	Shardingsphere-Ui	>= 4.1.1, < 5.0.0

References

http://www.openwall.com/lists/oss-security/2021/11/11/1Mailing List, Third Party Advisory
https://lists.apache.org/thread/4gzkm1zb6c97v9gl8lcz8ll5xr8o484cMailing List, Vendor Advisory
http://www.openwall.com/lists/oss-security/2021/11/11/1Mailing List, Third Party Advisory
https://lists.apache.org/thread/4gzkm1zb6c97v9gl8lcz8ll5xr8o484cMailing List, Vendor Advisory

Timeline

Published: Nov 11, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-26558?

How severe is CVE-2021-26558?

CVE-2021-26558 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.41% probability of exploitation in the next 30 days.

How do I fix CVE-2021-26558?

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-2021-26558?

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

Scan your code now

Source: NVD / NIST