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CVE-2021-4170

21
FAUCET Score

CVE-2021-4170 describes a Cross-site Scripting (XSS) vulnerability in calibre-web, specifically affecting the janeczku calibre-web product. This medium-severity flaw (CVSS 5.4) allows an authenticated attacker to inject malicious scripts into web pages, potentially leading to information disclosure or limited data manipulation, requiring user interaction to succeed. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.6.15CPE matchmatch criteria
cpe:2.3:a:janeczku:calibre-web:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.3HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.1
Impact Score
5.2
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.80%
Probability of exploitation in next 30 days
EPSS Percentile
52.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0080 is in the 88th percentile among its peer group of 15,239 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
pippatch availablevia ghsa
Product: calibrewebFixed in: 0.6.15

Vendor Advisories (1)

pipGHSA-wrp6-9w7f-3wxgmedium

calibre-web is vulnerable to Cross-site Scripting

Jan 21, 2022

References

github.com / janeczku/calibre-web/commit/7ad419dc8c12180e842a82118f4866ac3d074bc5
PatchThird Party Advisory
huntr.dev / bounties/ff395101-e392-401d-ab4f-579c63fbf6a0
ExploitThird Party Advisory