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CVE-2021-4103

21
FAUCET Score

CVE-2021-4103 is a stored Cross-site Scripting (XSS) vulnerability affecting b3log vditor versions prior to 1.0.34. This medium-severity flaw (CVSS 5.4) allows an authenticated attacker to inject malicious scripts, which could lead to limited impact on confidentiality and integrity, requiring user interaction to trigger. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.0.34CPE matchmatch criteria
cpe:2.3:a:b3log:vditor:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.8MEDIUM

CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
HIGH
Availability Impact
LOW
Exploitability Score
2.1
Impact Score
4.7
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.66%
Probability of exploitation in next 30 days
EPSS Percentile
48.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0066 is in the 81st percentile among its peer group of 15,224 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 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 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: vditorFixed in: 3.8.11

Vendor Advisories (1)

npmGHSA-cxm3-v4mv-6mh8medium

vditor Vulnerable to Cross-site Scripting in SVG events

Jan 28, 2022

References

github.com / vanessa219/vditor/commit/8d4d0889dd72b2f839e93a49db3da3a370416c7d
PatchThird Party Advisory
huntr.dev / bounties/67b980af-7357-4879-9448-a926c6474225
ExploitPatchThird Party Advisory