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CVE-2021-26558

25
FAUCET Score

CVE-2021-26558 is a Deserialization of Untrusted Data vulnerability in Apache ShardingSphere-UI versions 4.1.1 and later, but prior to 5.0.0, allowing attackers to inject external resources. This high-severity vulnerability (CVSS 7.5) can be exploited remotely without authentication, leading to high integrity impacts, though confidentiality and availability are not directly affected. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 4.1.1, < 5.0.0CPE matchmatch criteria
cpe:2.3:a:apache:shardingsphere-ui:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.41%
Probability of exploitation in next 30 days
EPSS Percentile
82.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0241 is in the 69th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 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

Remediation records are not available for this CVE.

References

lists.apache.org / thread/4gzkm1zb6c97v9gl8lcz8ll5xr8o484c
Mailing ListVendor Advisory
openwall.com / lists/oss-security/2021/11/11/1
Mailing ListThird Party Advisory